Many verses in the Qur’an are cryptic. While being aware of theological tools helps understand the meaning, in many instances, scientific findings, too, prove to be of use to unpack the mysteries therein. One of those verses I find fascinating is al-Isra 17:44:

“The seven heavens, the earth, and all that is in them glorify Him. There is nothing that does not glorify Him with praise, but you do not understand their glorification. Truly, He is Most Forbearing, Most Forgiving.”

In classical commentary, the phrase “the seven heavens, the earth, and all that is in them” is generally understood as a reference to all beings, conscious or unconscious. It is explained that everything glorifies God in its own way, though the nature of this glorification cannot be directly grasped by human understanding.

To go deeper into the meaning of this verse, we will first review approaches found in classical exegetical sources as well as modern interpretations. In particular, we will briefly highlight the commentary of Bediüzzaman Said Nursi in his work Ayetü’l-Kübrâ, a fifty-page treatise devoted in part to this verse. After that, we will present a framework of interpretation shaped by modern scientific findings, suggesting an alternative reading of the verse that accounts for both its metaphysical and physical dimensions. The broader goal is to contribute to a new interpretive ground at the intersection of revelation-based knowledge and scientific observation, through the universal laws that govern existence.

Glorifying God

In classical sources, the concept of tasbih (glorification) in this verse is often explained as all beings’ turning toward divine order and the Creator, each in its own way. For example, al-Tabari sees tasbih as each being worshiping God in its own language. Fakhr al-Din al-Razi states that sometimes this happens through words and sometimes through the state of existence itself, and that it can only be grasped by those with intellect. Ibn Kathir considers the tasbih of all beings to be real, though imperceptible to human senses. Elmalılı Hamdi Yazır emphasizes that the order in the universe itself demonstrates a kind of tasbih.

A common point among these classical commentators is that tasbih occurs on two levels: through spoken expression (lisan al-qal) and through existential state (lisan al-hal). This dual approach applies both to conscious beings (such as humans) and unconscious beings (such as stones, air, or atoms). The verse highlights that this universal glorification operates on a level beyond human comprehension. Thus, tasbih is not limited to conscious acts of worship but can also be understood as the ongoing and all-encompassing order within the natural world.

From this perspective, the workings, regularities, and interrelations of all things—from subatomic particles to galaxies—can be seen as manifestations of divine laws, a kind of ontological tasbih. The cosmological view offered by the verse thus points to a profound overlap between the natural laws discovered by modern science and the metaphysical insights of classical thought.

Modern interpretations tend to explain tasbih as beings’ fulfilling their functions in line with their purpose of creation and their inherent nature (fitrah). In this sense, even if not a conscious act of worship, every being is seen as glorifying God through its orientation embedded in creation. Each being’s continuation of existence according to its own nature is also considered tasbih.

In this framework, tasbih is not limited to conscious expressions but includes the structural order, physical laws, and natural processes observed throughout the universe. Modern interpretations therefore understand tasbih as an ontological orientation: every being continues its existence in accordance with its own internal laws and physical limits. This shows that tasbih is not only a religious or metaphysical concept but also resonates with the idea of natural order observed by science.

In his treatise Ayetü’l-Kübrâ, Bediüzzaman Said Nursi discusses tasbih on both metaphysical and ontological levels. He likens the universe to a book and every being to a letter or sentence in that book, each directly remembering the Creator. For him, tasbih is not merely metaphorical but a true glorification that each being performs through its existential function. Nursi structures his metaphysical reflections through contemplation, grounding what is perceivable in rational thought.

He emphasizes that the continuity and order seen throughout the cosmos directly point to the Creator: “The entirety of the universe glorifies its Maker with true remembrance.” “The manifestations of divine power appear in everything, and each being declares: There is no god but He.” “With the motion of particles, a glorification, remembrance, and worship take place.” “Every creature has a task; its task is worship.” These statements highlight how all beings, from subatomic particles to the cosmic whole, operate within law, order, and functionality.

When compared with modern interpretations, Nursi’s approach shows some key differences. While modern exegetes often see tasbih as symbolic or systematic order—beings acting in line with their purpose of creation—Nursi considers it direct and real. For him, every being actively and consciously glorifies God. His approach integrates physical reality with a metaphysical perspective, presenting creation as not only “existent” but also “meaningful.” This resonates with both classical and modern interpretations while adding a contemplative dimension that speaks to modern seekers of meaning.

Nursi even describes the entire universe as a grand assembly of remembrance (common ground for everything but Allah): “The heavens, the earth, and all within them are like a great gathering of remembrance. Every atom praises God in its own language. Humans may not perceive this praise, but it is real.” This view emphasizes that the order of the universe is not only physical but also meaningful and holistic.

What do scientific findings say?

In continuing this discussion, our focus will shift to how this “common ground” can be conceptualized in light of modern scientific discoveries. That is, how the building blocks, laws, and principles uniting all beings in the universe can be understood through contemporary science.

The idea of glorification through words (tasbih by speech) is easily understood as conscious beings verbally exalting God. But how should glorification through state (tasbih by being) be understood? Both classical and modern interpretations agree that all beings and events are bound by divine laws governing their existence and functioning. This compulsory harmony and order can be seen as the creation glorifying its Creator. Still, this idea may seem abstract at first, so it requires explanation. In particular, we will explore what modern science offers for understanding tasbih by being.

Science gives us several fundamental elements that reveal a common ground uniting all of existence. Among these are shared building blocks (subatomic particles), universal physical laws, common origins, and systematic methods of observation and interpretation. Every being demonstrates, in its own context, that it is part of the larger whole through structural similarities and compliance with shared laws.

At the microscopic level, this unity is especially clear. All observable entities are made of atoms—small and discrete units. The atomic structure is universal: a nucleus of protons and neutrons, surrounded by a cloud of electrons. These fundamental particles themselves are composed of even more basic particles such as quarks and leptons. Thus, all material systems are built from the same components in varying combinations.

In addition to this shared structure, quantum numbers define the order within atoms, governing matter’s behavior at a universal level. The position and energy of electrons are described by four quantum numbers:

• n: the principal quantum number, indicating energy level,

• l: angular momentum, describing orbital shape,

• ml: orientation of the orbital in space,

• ms: electron spin.

By the Pauli exclusion principle, no two electrons in an atom can share the same four quantum numbers. This rule shows that universal order operates even at the subatomic level. Each particle has a unique position in this order.

Other principles, such as Hund’s rule (that electrons are first singly filled with the same spin before they are filled doubly) and the Aufbau principle (that electrons first fill subshells of the lowest available energy, then those of higher energy), further highlight this extraordinary order, leaving no room for randomness at the atomic level. Together, they point to a coherent, universal structure encompassing all matter. In Nursi’s words, this could be seen as a shared “mosque” for all creation.

Each particle’s individuality—defined by its unique quantum state—coexists with the universality of the shared laws. In religious terminology, this can be linked to Ahadiyyah (the unique individuality of each being) and Wahidiyya (the unity of all beings within one system). While a deeper discussion of these theological concepts is beyond the scope of this article, we note that even in physical reality, these dual dimensions of uniqueness and unity are observable.

One of the most striking scientific principles supporting this universal order is Heisenberg’s Uncertainty Principle. This principle points to a limit built into the very structure of nature: it is impossible to know both the exact position and momentum of a particle at the same time. This is not due to shortcomings in measurement tools but due to the nature of reality itself. It reveals an inherent “limit of knowledge” in the physical world.

As such, the principle is not only a physical rule but also an epistemological sign: it defines the boundaries of human knowledge about nature. In a metaphysical reading, it indirectly suggests an unbridgeable difference between Creator and creation. While natural laws provide knowledge, the limits of this knowledge reveal the boundaries of human existence and understanding.

Conclusion

In this study, we have attempted to interpret the concept of tasbih in Qur’an 17:44 through both classical and modern exegesis, alongside insights from contemporary science. The order observed in creation, from the quantum level to cosmic structures, manifests laws and harmony that align with the Qur’anic concept of glorification. This perspective allows us to reconsider the idea of tasbih by being in a scientific framework.

In short, the laws, order, and functionality observed in the universe can be seen as signs of beings’ connection to their Creator, a form of existential orientation. The author hopes that this article may serve as a modest attempt to show how scientific discoveries can contribute to a deeper understanding of a Qur’anic expression.

Cancer is a prevalent disease among humans and animals, affecting millions of lives across the globe. It can be caused in a variety of ways and can affect virtually every part of our bodies, ranging from skin cancer caused by prolonged exposure to the sun’s harmful UV rays to lung cancer that results from carcinogenic substances smokers inhale. However, plants do not die of cancer despite sometimes being exposed to the sun for over a thousand years – and they do not use any sunscreens!

Humans and animals who live to a certain age are very likely to get cancer one day. We see this situation mostly in our pets which have been specially bred and protected from predators and diseases. Cancer has become part of our lives and remains a top world health priority. The probability of prostate cancer is roughly 80% in 80-year-olds, 90% in 90-year-olds, and 100% in 100-year-olds. However, these statistics yet again do not apply to trees.

What is cancer?

Cancer is a disease caused by the uncontrolled growth of cells that have become abnormal in a part of the body. These abnormal cells are not foreign invaders that have entered our bodies from outside but are instead our own cells. However, in time, various factors such as radiation, viruses, and chemical substances that they are exposed to cause the accumulation of errors, or mutations, in the genetic codes of cells. Some of them then acquire very different characteristics and become alien to their own body.

With old age, errors arise in the genetic code in an increased rate when our cells divide by copying their own DNA. External factors, such as “free radicals” and various radiations that affect our DNA, play a role in these errors. For young people, when there are too many errors in a cell’s genome, a process called “apoptosis” takes place after which faulty cells die before they can multiply in a potentially cancerous manner and forming a tumor. However, sometimes these accumulated errors cause the cell’s growth process to become stuck in the “on” position, and the cell begins to grow and divide continuously. Cells that emerge with out-of-control divisions ignore the commands coming from the healthy cells of the body, continue to grow and reproduce according to the erroneous commands from the cell’s disrupted genome. This situation lasts until death.

What is a tumor?

Cell growths that result from defective genome proliferation will eventually form a mass called a tumor. Some cells grow very slowly and stop at a certain size after a while and do not spread anymore and are called benign tumors. Masses formed by fast-growing, defective (cancerous) cells are known as malignant tumors. Cells that detach from malignant tumors and grow rapidly can attach to another organ where they will begin to grow again when they enter the bloodstream. The process by which cancerous cells start from a tumor and spread all over the body to different organs is known as metastasis.

Why does this process not happen in plants?

One of the most destructive features of cancer when it enters metastasis is the mobility of malignant cells to varying degrees according to their type. Blood vessels, i.e. the transportation pathways of the circulatory system, act like a highway for cancer cells. As the blood vessels surround the entire body, a single cancerous cell can travel to and settle almost anywhere in the body, from the toes to the head.

Plant cells have a vital feature that is different from human and animal cells. In plants, cells do not change their locations because their cells are surrounded by a very rigid, strong, and impenetrable wall outside of normal plasma membranes. Cell walls are made of cellulose, which constitutes the main substance of plants, and form the wooden structures that ensure the plants stand upright and harden while at the same time locking each cell in place and preventing it from migrating within the organism.

Another important difference that is unique to plants is that they do not have blood circulation in which cells are carried; they have a circulatory system in which only water and food are carried. This system is often used to pump water from the roots to the leaves and to transport organic products such as sugar, which is a product of photosynthesis, from the leaves down. Therefore, there are no blood cells or immune system cells in these carrier channels, which are known as wood and roe tubes (xylem and phloem), in plants.

In addition, animal cells are specifically employed in tissues and organs such as muscle, bone, liver, and skin during embryonic development. Thus, when they divide only new cells of the same type are created. Tumors that occur in animal tissues can metastasize into different tissues and disrupt different organs. We can think of animal and human biology as a very complex system in which each cell, tissue, and organ has a task and purpose. In such a system, all elements work in cooperation for the continuation of life. This system is of a kind of irreducible complexity. A human being cannot live without organs like brain, heart, or lungs, while plants, on the other hand, have fewer simpler internal structures which are not as vital. When plant cells divide, they retain their ability to form new cells of any type. This is called totipotency.

In plants, every necessary structure can be recreated from the few tissues they have. For this reason, a gardener can grow new plants from the roots, branches, or leaf parts of a plant.

Plants are equipped with very powerful antioxidants to protect them from the sun’s harmful rays and mutations that may be caused by radiation. Therefore, tumors can develop only due to bacteria, viruses, fungi, parasites, and insects. For example, in a situation that we can call “information confusion” that occurs when Agrobacterium Tumefaciens bacteria insert some of its DNA into the plant’s DNA, an anomaly occurs in the plant’s genome. Cells that go through a rapid growth process and form tumors are not normally classified as cancer, since they simply remain in that area and cannot be transported elsewhere. Since the tumors cannot spread to the whole plant, they may cause only minor distress at most in a specific area rather than a fatal disease such as cancer. Just as the plant continues to grow around a rock that it encounters, it grows around the tumor as well. The tumor can continue to grow for years, but does not spread to the rest of the plant, meaning there is no metastasis.

In summary, plants can also be cancerous, but a cancerous tumor is not a deadly threat to a plant, as its cells are immobile and do not have vital and complex organs like humans and animals. Thanks to the cellulose walls gifted to the them, plants continue their role in the ecosystem by continuing to grow with healthy cells around the tumor as if nothing had happened.

References

• Luis Villazon. “Can a plant die of cancer?” www.sciencefocus.com/nature/can-a-plant-die-of-cancer
• Sam Westreich. “Do Plants Get Cancer?” medium.com/@westwise/do-plants-get-cancer-60eb435c6d1a
• Stuart Thompson. “Plants couldn’t run away from Chernobyl—but that’s what saved them. Why plants don’t get cancer.” www.popsci.com/chernobyl-plants-radiation-cancer

When I entered the room, the patient’s wife and adult son were standing in a corner with a nurse, staring at the deceased, wearing grim and shocked faces. It was the oddest thing, because he died while actively getting out of bed to go to the bathroom. His wife looked at me, feeling the need to explain, and said, “He just said he had to go to the bathroom. That was all he said, and he started to get up.”  

One leg was already off the bed, not quite touching the floor. Mr. Griffin was wearing boxer shorts and a tee-shirt. He looked to be in his 50s. The whole length of his body was uncovered, revealing a tall, thin frame. He was lying on his side, on the edge of the bed, with one arm bent at the elbow, hand splayed, as if using it to push off.

Suspended in mid-air, Mr. Griffin was positioned like an action figure, basically half off the bed. I was inclined to run to catch him, before he fell. His facial expression was frozen, but not in surprise. Rather, his eyes were wide open, lips parted, and intent for his destination. But Mr. Griffin had been caught unaware in the act of dying and stopped by the instant of his death.

I asked the nurse to please place the man in a more relaxed position and cover him, while I escorted the family from the room to comfort them.

My grandfather, who lived into his nineties, would always say, “I’m not going to die one second before my time on earth is up.” As a Muslim, he was informed by the Qur’an, which states, not unlike the Bible, that every living thing has an appointed time on earth, known only to the Creator.

The image of Mr. Griffin sometimes visits me when I am praying. Usually, it’s a time when I feel rushed to get my prayer over with (and get back to my friends), or at a time when I realize, regrettably, that I am praying by rote.  My next thought forms the question: Why am I rushing, when this could be my last breath or action?

My witness of Mr. Griffin in death has given me an indisputable piece of empirical evidence that my next breath is not guaranteed.

For a believer (no matter what religion), being in prayer is a sacred space and an opportunity to become aware of God’s presence. God-consciousness intensifies a sense of inner peace, and I would certainly prefer to die in this state of mind than get caught unaware.

Being God-conscious is the counterpoint to praying by rote, which is a state of ungratifying unconsciousness. I recognize that in this unconscious state, I take everything about my existence for granted, including the movement of my hands and legs, my breathing, and even whatever or whoever is waiting for me, when I am finished my obligation.

In fact, for those God-conscious people who have worked hard to establish prayer in life, the mindlessness of praying by rote defeats the whole purpose of taking time out to pray. . For those trying to establish prayer in their life, praying by rote is counter-productive and , actually makes it harder to establish daily prayers.

I should point out that praying by rote is not synonymous with praying by force of habit. Good habits are hard to form, require self-discipline, and are more akin to achievements. Self-discipline is one of the fruits of recognizing our self-worth. Taking time out (five times a day for a Muslim) to create a sacred space from the routine of another mindless, busy day is a discipline of mindfulness gained, similar to meditation, which has an appeal for similar reasons.

In Islam, however, prayer is something more than meditation. For being and fulfilling an obligation, it brings with it the inner peace of self-satisfaction. In addition to the satisfaction of self-discipline, prayer has a sacred purpose and brings with it the promise of a greater, unimagined reward in the hereafter.

Since my visit to Mr. Griffin, I am more immune to praying by rote. Carving out the time in my day and praying in a sacred space gives me an opportunity to occupy my mind, not in a superficial way, but in deep reflection. As I reflect on the existence of an All-loving, All-just, All-powerful, All-forgiving, and All-knowing Supreme power, I find myself listening to the rhythm of my breathing. Furthermore, as I enter into a state of pious mindfulness known in Islam as the Arabic word, “taqwa,” I pray for this precious God-consciousness to stay with me, because I know that it increases my appreciation for everything and everyone in my daily life.

Until today, almost all of your organs and systems introduced themselves and explained the great artistry in their creation along with their wisdom and precision. Certainly, these were not just for your information. Of course, it is important for you to know about your organs and their duties, and for you to live accordingly with this knowledge. However, its main purpose has been to introduce you to your Lord, who created you and all living and nonliving things perfectly. Just like seeing a work of art and not appreciating the artist is a twisted view, so is seeing the art exhibited on the body of the world’s most dignified entity, the human being, and not appreciating our Lord. It would just be a worthless and pointless heap of knowledge.

Today, we will look at the human body statistically, have our last lesson, and say goodbye.

Before we talk about the systems and organs that make up your body, you should know that it is a blessing that God didn’t leave you in nonexistence, and put you into existence. Then, you should know that it is also a blessing that He didn’t leave you as inorganic molecules, but created you as a living organism. For you to understand better, I would like you to look carefully at the delicate measures of the numbers I will give you in the tables below and to realize how high your value has been lifted.

The weights and percentages of inorganic elements in a 70 kg human body:

Oxygen…….. 44 kg……. 63%
Carbon……. 14 kg……. 20%
Hydrogen……. 7 kg……. 10%
Nitrogen……. 2.1 kg……. 3%
Calcium……. 1 kg……. 1.5%
Phosphorus……. 700 g……. 1%
Potassium……. 170 g……. 0.25%
Sulfur….. 140 g……. 0,2%
Chlorine……. 70 g……. 0.1%
Sodium….. 70 g……. 0.1%
Magnesium.. 30 g……. 0.04%
Iron…… 3 g……. 0.004%
Copper…… 300 mg……. 0.0005%
Manganese….. 100 mg……. 0.0002%
Iodine……. 30 mg……. 0.00004%

The total percentage of trace elements found in the blood serum and in enzymes, such as zinc, cobalt, cadmium, molybdenum, nickel, lead, fluorine, selenium, mercury, and aluminum, is 0.80526%.

As you can see, 76% of you (53.1 kg of oxygen, hydrogen, and nitrogen) are gases that dissolve into the air. These aren’t worth anything because there are plenty of them in the air. From 14 cents per kilogram, 14 kilograms of carbon (coal) is worth around 2 dollars. One kilogram calcium (lime) is worth around 12 cents. 140 grams of chlorine and sodium together (salt) is worth around 3 cents. All of the other elements (such as iron, copper, and magnesium) are worth a handful of soil, because they are found easily in soil, and there is only very little of them in the human body. So in total, your elements are worth $2.15.

Let’s increase your value a little bit! Our Lord didn’t leave you as elements; He turned you into organic material with very large molecules, such as protein, fat, carbohydrates, and vitamins. That gives us the table below:
Organ…. Water (%) …. Fat (%)…… Protein (%)…. Ash (%)
Skin…… 64.68…… 13.00…… 22.10…… 0.68
Skeleton…… 31.81…… 17.18…… 18.93…… 28.91
Teeth…… 5.00…… 0.00…… 23.00…… 70.90
Skeletal muscle…… 79.52…… 3.35…… 16.50…… 0.93
Brain-Spinal cord…… 73.33…… 12.68…… 12.06…… 1.37
Liver…… 71.46…… 10.35…… 16.19…… 0.88
Heart…… 73.69…… 9.26…… 15.88…… 0.80
Lungs…… 83.74…… 1.54…… 13.38…… 0.95
Spleen…… 78.69…… 1.19…… 17.81…… 1.13
Kidneys…… 79.47…… 4.01…… 14.69…… 0.96
Pancreas…… 73.08…… 13.08…… 12.69…… 0.93
Intestines…… 79.07…… 6.24…… 13.19…… 0.86
Adipose tissue…… 50.09….. 42.44…… 7.06…… 0.51
Other tissues…… 70.40…… 12.39…… 16.06…… 1.01
Blood and lymph…… 93.33…… 0.17…… 5.68…… 0.94
Total…… 67.85…… 12.51…… 14.39…… 4.84

If you wonder about your value as water, protein, fat, and ash, you can calculate it according to a 70 kg person. If you do this, you can see that you are made up of 47.495 kilograms of water, 8.757 kg fat, 10.073 kg protein and 3.388 kg ash (mineral salts). Since the water in you is dirty and not clear, it isn’t worth anything. Your minerals and ash aren’t worth anything because there are plenty of them in soil. For $1.42 per kilogram, your fat is worth around $12.86. Your protein is worth around 16 kilograms of lamb, which costs around $36.57. So when you are elevated from elemental material to organic material, your value rises up to around $50.

Of course, our Lord didn’t leave you like this. He created you in the form of organs and tissues, which carry out miraculous tasks so that you can stay alive. Now, let’s see the groups of trillions of differentiated cells:

Total number of cells in the human body………… around 100 trillion
Number of cells that die in one second…………around 50 million
Number of cells created in one second…………around 50 million
Number of cell types…………more than 200
Number of red blood cells in 5 liters of blood…………25 trillion
Height reached by putting all of our red blood cells on top of each other…………around 60.000 km
Length reached by putting all of our red blood cells side by side…………192.500 km
Red blood cells’ surface area………..more than 1000 m2
Number of white blood cells (leucocytes) in our blood…………40 billion
Number of nerve cells…………30 billion
Length of a sperm…………35 micrometers
Diameter of an egg cell…………100-120 micrometers
Average length of a liver cell…………30-50 micrometers
Lifespan of small intestine mucous cells…………1.4 days
Lifespan of stomach entrance area (cardia) mucous cells…………9.1 days
Lifespan of stomach exit area (pylorus) mucous cells…………1.8 days
Lifespan of epithelial cells in lung alveoli…………8.1 days
Lifespan of large intestine (colon) mucous cells…………10 days
Lifespan of upper skin (epidermis) cells…………19.2 days
Lifespan of covering epithelial cells in the bladder…………66.5 days
Lifespan of neutrophile leucocytes…………45 days
Lifespan of eosinophile leucocytes…………10 days
Lifespan of lymphocytes…………5 days to 1 year
Lifespan of monocytes…………months
Lifespan of red blood cells…………120 days
Number of times a red blood cell travels the body during its life…………300.000
Number of red blood cells generated in a second…………2.4 million
Number of red blood cells generated in a day…………208 billion
Lifespan of a liver cell…………222 days
Lifespan of a kidney cell…………286 days
Number of mitochondria (power plant) in a nerve cell…………up to 10.000
Number of ribosomes created in a liver cell in one second…………180
Total length of the DNA in one cell…………2 m
Number of muscles in the body…………around 600
Number of muscles that work when smiling…………15
Number of muscles that work when frowning…………43
Total amount of work done by our muscles in one day
(Equal to lifting a 6 ton truck 50 meters into the air with a crane)…………around 3.106 Newtons
Total number of capillaries…………30 billion
Number of alveoli in the lungs…………400 million
Total amount of air taken in by the lungs in one day……………around 10.000 liters
Total amount of air we use in 75 years…………around 285 million liters
Total length of the nephrons in the kidney…………around 50 km
Total length of the glomerulus capillaries in the kidney…………around 25 km
Total inner surface area of the kidney channels…………20 m2
Total filtration area of the Bowman capsules in the kidney…………1 m2
Total skin weight…………11.15 kg
Total surface area of the skin…………1.5-1.8 m2
Total length of capillaries in 1 cm2 of skin…………around 1 m
Weight of dead keratin cells that fall off the skin in one day…………10 gr
Length of the nerve fibers in the skin…………80 km
Number of sweat glands…………around 2 million
Number of sebaceous glands in the skin on the head…………around 120.000
Total number of cells in the skin…………around 100 billion
Number of sensory receptors in the skin…………around 60 million
Daily sweat amount…………800 ml
Maximum daily sweat amount…………18 liters
Number of cells in the retina…………127 million
Number of values of the same color our eye can distinguish…………around 200
Number of shades of light that we can perceive…………around 500

The reason I gave all these numbers was not just to show the multitude of cells, organs, and tissues, but to emphasize that our Lord can create these with the precision that He creates a single cell. Mammals also have the organs and tissues that I have mentioned. Besides, some mammals have different organs with superior aspects. From this point of view, we are not much different from a cow or a horse. However, our Lord says that He created us in the best form possible, equipped us with superior qualities, and granted us the authority over all creation. Dear Peter! It’s time that you shed out of being an animal and rise to the degree of humanity. You cannot do this with your cells, organs, or tissues, but by gaining knowledge of divinity via spiritual virtues (such as the mind, conscience, and free will) that our Lord gave you.

If we see our body as a palace, could the stones, glass, porcelain, and wood come together and say, “Come on let’s make a palace, which will be the greatest palace in the world.” Could elements first turn into organic matter with macromolecules, then into cell organelles, then into cells, and finally into cells with different special duties, all on their own?

Finally, I believe it will be useful to give a table that shows every organ’s share in your body. My advice is not to evaluate anything materially. You cannot live without your pancreas, which only takes up a very small part of your body. Your heart, which is only 0.7% of your body, pumps the water of life (blood) to all of your organs; and your brain, which is 3.5%, manages your whole body. You can never give up on your kidneys, which take up only 0.5%.

Percentages of organ weights to the total body weight
Skeletal muscle (red meat)…………31.56 %
Skeleton and teeth…………14.90 %
Adipose tissue…………13.63 %
Skin…………7.81 %
Blood and lymph…………3.77 %
Lungs…………4.15 %
Brain and spinal cord…………3.52 %
Liver…………3.41 %
Intestines and stomach…………2.07 %
Kidneys…………0.51 %
Heart…………0.69 %
Spleen…………0.19 %
Pancreas…………0.16 %
Cartilage, ligaments, blood vessels and peripheral nerves…………13.63 %

All in all, we can say that the human body has holistic perfection with its functional parts, from hair to nail, to intestines and kidneys, as well as its aesthetic beauty.

Dear Peter! We have talked with you for a long time. I hope it was useful. I did everything I could. I am sorry that I couldn’t portray your true value!

White blood cells (leukocytes) are fewer in number and their duty is to fight against germs. How this process works is to be expounded by the immune system under a separate title. The red blood cells are my main building blocks and they are born by the dividing of the main cells in the bone marrow. After passing through a few phases, they lose their nucleus and are filled instead with hemoglobin, a magnificent substance containing iron. Hemoglobin’s most vital function is its binding oxygen and then carbon dioxide after releasing it. Hemoglobin reaches everywhere, traveling with the blood stream. When it comes to the lungs, hemoglobin dumps the carbon dioxide and replaces is with oxygen. Then it supplies this oxygen to the cells and removes the carbon dioxide, which is produced by burning organic compounds. So its short life passes with the same ceaseless cycle to continue your life. Hemoglobin molecules’ longevity is approximately 120 days. They contain no cell elements like ribosome, mitochondria, and nucleus and therefore cannot repair themselves. They simply die when they get old. Sad? Not at all! Red blood cells fulfill the duty they were created for and leave the stage for new ones. They are broken down in the liver and bone marrow and the iron they contain is absorbed. A certain part is transformed into bilirubin, giving bile its yellow color. As you see, nothing is truly wasted.

The red blood cells in circulation number around 25 trillion, and this number does not vary greatly, as the dying ones are constantly replaced. Their measuring gives doctors an idea about possible diseases. The amount depends on various factors’ reciprocal balance. A hormone (erythropoietin) secreted by the kidneys increases the rate of production of red blood cells, in response to falling levels of oxygen in the tissues. If you lose blood due to an accident or medical operation, the stem cells in the bone marrow receive an emergency alert to produce more red blood cells. On the other hand, if you get a blood transfer, stem cells are ordered to stop producing, due to the excess of red blood cells. You see, even such basic knowledge about bodily systems fills the learner with wonder.

Deficiency of red blood cells, scientifically known as anemia, should not be ignored. It results in pallor and weariness; you feel like sleeping more. In order to avoid this condition, your body needs different things such as group B vitamins (B6, B11, B12), vitamin C, amino acids, and iron. Since it is hard to pinpoint the deficient substance, doctors generally prescribe iron-rich multivitamin supplements.

Red blood cells divide into four types, which determine the blood groups A, B, 0, and AB. In addition to the blood group, another feature known as Rh (rhesus) factor is important to know particularly before a blood transfer. Transferring the wrong type of blood may result in death.

Platelets, which are scale-shaped cells and circulate with me are not independent; they are pieces which came off bigger cells. In a cubic millimeter of blood, 250 to 350 thousand of these little scales are found and their duty is of vital importance. If it weren’t for these pieces, the slightest cut could cause death because your bleeding would not stop. Clotting is a great blessing. It usually blocks the surface of a wound within five minutes, stopping the flow of blood and saving your life. Clotting is realized through particular molecules in these minute scales as a result of a complex chain of reactions using enzymes, vitamins, and salts. Every step of this chain of reactions is another stitch to fix the wound. Other blood cells pile up and stick together behind this net and they dry up. If such clotting occurred inside the blood vessels, it would make a disastrous effect by blocking the bloodstream. I also have enzymes to break down little amounts of such clotting. As you see, everything is splendidly organized.

Peter! A blood test reveals very critical medical data. As I visit every organ, I exchange certain substances with them. Therefore, detection of an unusual substance in me can be an early warning for a disease. Nowadays, it even helps an early diagnosis of cancer.

It is not so easy for me to explain the wisdom behind all of my duties and capabilities. But to give you an idea, there are specialized departments for studying just me at medical faculties and research institutions throughout the world.

We vessels can be divided into three main groups in terms of structure and function. The ones with thicker walls, which bring every organ the blood they need from the heart, are the arteries. The pressure inside us is higher and we easily carry blood to the organs. The ones with thinner walls, lower pressure, and larger inner space are called veins. As a matter of fact, both arteries and veins have a three-layered structure that is very suitable for holding a fluid like blood. Since our walls are strengthened with both connective tissue and smooth muscle layers, we bear the pressure coming from the heart and help blood proceed by contracting and relaxing. Since arteries are directly subjected to the strong pressure from the heart, our walls were created in a thicker and stronger form. Since the veins return blood to the heart and thus have lower pressure, we have valves that close after blood passes, so it does not flow backward due to gravity. This is a serious challenge for the blood passing through your legs. Varicose veins might develop due to weight gain from pregnancy or obesity, which increases pressure on the legs, or to hours of standing, walking, or running on hard surfaces.

Capillaries are the most delicate blood vessels, with walls made of a single layer of epithelium, which enables us to exchange substances between blood and tissues. As blood vessels, our total length is about 120,000 kilometers. Try to imagine if a fisherman’s net were made from a rope of this length and how wide it would be! And yet, such a vast network of blood vessels is located in your body, and capillaries take blood to every part, without neglecting an area as tiny as the head of a pin.

The well-being of your organs is directly related to us. If our interiors begin to narrow, because of fatty cholesterol plaque for instance, then we begin to lose our flexibility. This means malnutrition for that organ, since a lesser amount of blood than expected can come. If a blood clot sticks to our wall and blocks the blood flow, the relevant organ may be in terrible trouble. If other arteries supply blood to that organ, then it can handle this, but if a main artery is blocked and if secondary channels do not exist or are insufficient, you experience infarction. Taking this into consideration, you need to be careful what you eat and lead a physically active life. When you get old, if sufficient blood does not pass through us in your brain, failures with brain activities appear and you go senile. As the walls of veins and arteries have a rich network of nerves, we let the suitable amount of blood flow according to the need of the organ we’re serving, under the control of the autonomous nervous system. While blood vessels that are connected to an organ not currently requiring much blood contract to reduce the amount supplied, those that are connected to currently more active organs expand. And dear Peter, the greatest blessing here is that none of these activities require any conscious effort from you; everything works smoothly without your even being aware.

This wonderful network of ours finds its value in the vital fluid we carry. If it weren’t for blood, we would have no value at all, and such a perfect means of distribution would be unnecessary. Even the duty of the heart is to make this fluid circulate throughout the body. Now, let us step aside and allow blood to have the floor.

All the organs functioning in your body have a direct or indirect relationship with me. I can be compared to a kind of “chemical brain.” All metabolic activities are among my duties, including the control of excretions, digestion, and the composition of blood. You would be stupefied if I listed every single function I carry out, but let me tell you this much: biochemists have discovered that I am directly included in more than 80 different activities and related to more than 5,000 chemical reactions taking place in your body. Surprised? But this is only what they’ve learned so far; you do not know me in detail yet. My plain appearance is in contrast with my numerous functions. My size is about one-tenth of the body of a six-month-old fetus; now that you have become a young man, I weigh about one fiftieth of your body weight. Since I am the largest excretory organ in your body, I am firmly strapped with mesentery so you can run, jump, and make other movements without trouble.

Most people see me merely as a bile-producing organ, which happens to be among the simplest of my duties. Let me explain it another way: the heat I produce while working is equal to one-third of the heat your body produces while resting. I have a special circulatory system. Since I am located at a “junction,” the blood coming from the intestines which bear nutrient molecules come to my vein first together with the blood from the spleen, before joining the rest of the bloodstream. It can be compared to an obligatory customs check. The amount of blood I supervise within 24 hours is about 2,000 liters. With every heartbeat, almost 28 percent of the blood being pumped passes through me.

I adjust the level of blood sugar in a very sensitive balance. If you eat desserts or pastries I convert excess sugar into glycogen (animal starch) and store it. If your blood sugar decreases from hunger, I break down glycogen into sugar (glucose) and come to your help so that you do not come to a halt, like a car out of fuel.

I use various protein molecules to synthesize numerous enzymes. I also play a role in blood coagulation, red blood cell production, and storing the iron you need. You know, nothing is wasted in the divine system of nature. So how can I waste anything? When the aged red blood cells die, I help the spleen to break them down and store the iron they contain. My job in fat metabolism is no less important. Thanks to the bile I produce, the fatty food you eat is broken down to smaller molecules to be absorbed in a way similar to detergents remove oily remnants from dishes. Naturally, the fat-soluble vitamins (A, D, E, K) are also absorbed along the process. I store the excess of both these vitamins and fats. Fats are an important fuel particularly for your heart muscles. I excrete an average of 600–700 grams of bile a day. Two minutes after oily foods pass to duodenum the walls of my gallbladder are operated. Through contractions of 2–6 times a minute and a pressure of 25–30 mmHg, the bile is passed to duodenum in a time span of 15 to 90 minutes. What gives bile its yellowish-green color is the substance named bilirubin, which appears with the breaking down of the old red blood cells and disposed of through the bowels.

The Kuppffer cells—as you name them—have the duty of checking out newly produced blood cells one by one in addition to producing antibodies against germs. If any ill-formed blood cells come up, I must detect and destroy them. Otherwise they corrupt your blood. Thanks to the Kuppffer cells, the ill-formed blood cells are destroyed as soon as they are detected.

The average longevity of my cells varies between 150-180 days (220 days maximum). New cells are produced immediately to replace the dying ones and the system works smoothly. In each of these cells there are 1,000-3,000 mitochondria and millions of ribosome. An average of 180 new ribosome are produced every second. Although none of my cells have consciousness or intelligence, thousands of them come together to form little lobes resembling hexagons. The number of these lobes varies between 50,000 to 100,000.

Dear Peter, you intake various toxic substances together with the foods you eat. You don’t even realize that food has been corrupted by bacteria and fungi until its taste changes. Frankly, you should not have lived very long with so much toxic intake; Providence has given me an important duty to protect you from such harm. I capture these toxic compounds released into your bloodstream and neutralize them. The same goes for different medicines you take; I try to neutralize their toxic effects as well. But I have my own limits of tolerance; if I am faced with more toxic substances than I can handle, then I give signals of danger. You wonder how. Well, I shout “help” through red spots in your hands and itchy spots on your skin. You should be more careful about what goes down your throat.

Given that I fulfill various important functions, the littlest failure in me reveals itself as a health problem immediately. Hepatitis is among the common diseases heralding my failure. Excessive increase of bilirubin in your blood causes the white of your eye and your skin to turn yellow. I fear viruses most. Particularly hepatitis B and C viruses destroy my tissue. And alcohol, as you know, is my sworn enemy. I have to exert myself to neutralize even a tiny amount of alcohol. And if the hepatitis virus is added, I become knocked down and contract cirrhosis. It does not happen suddenly, though. Along the process which you know as liver failure I give various signals: skin eruption, digestion problems, sleepiness, and headache after meals, and so on. Since these symptoms are not serious problems, most people ignore these signals I give. Due to my various functions, the lab tests about me are more than a hundred.

Talking about my enemies may have upset you a bit, but it’s not all doom and gloom. After all, I am the organ with the highest capacity to renew itself. Sounds good, right? Otherwise I would have been finished off long ago, so this ability is a real blessing. Let me give you an example: although 90 percent of my cells are destroyed during hepatitis, I can help you survive with the remaining 10 percent if you rest well and control what you eat. If you ignore the disease, it might lead you and me to the grave. Do not ever believe those who take this lightly and say: “This doctor says that a small amount of alcohol is good for health.” Tell it to the marines. Those who say that should visit hospitals first. I’m sorry, Peter, but it really gets on my nerves. If they could only appreciate a work of art like me. Anyway, that’s all for now, please take good care of me.

We are three pairs of large glands that secrete into the mouth through canals and hundreds of very small glands around the throat. The large glands in front of the ear area are called the parotid glands, the glands under the chin are called the submandibular glands, and the ones under the tongue are called the sublingual glands. The parotid glands secrete saliva from the sides of the upper molar teeth, the submandibular glands from the front under the tongue, and the sublingual glands from many openings in the mouth’s base. There are also many more salivary glands in your inner cheeks and lips, and in all other wet spots in your mouth and throat.

Every sugary and starchy food you eat must first interact with our secretion in order to be digested. For this, an enzyme called ptyalin has been placed within us. But for this enzyme to work properly you must chew your food well. Also, you shouldn’t eat anything that is too hot or too cold, or anything that could change the pH (acidity) level of your mouth. Otherwise, this enzyme cannot function correctly. We produce an average of about 1000 milliliters (one liter) of secretion every day; however, we have the capacity to produce 1.5 liters of saliva per day.

Sometimes, the calcium in our enzymes may precipitate and form tartar due to acidic foods. Tartar can sometimes block our secretion canals. When you eat something, saliva production accelerates; but if our secretion canals are blocked by tartar, then the saliva cannot flow. This causes infection accompanied by severe pain and swelling. If our canals aren’t completely blocked, we may swell a little while eating, but we will slowly deflate after a while. Microbes can reproduce easier in accumulated saliva that cannot flow, thus causing severe pain and swelling. Our most frequently seen infection is the one that makes the parotid glands swell up, and is called the “mumps”. Even though it is seen more frequently in children, it may also be observed in adults. The swelling of both of the parotid glands is more frequent in alcoholics.

The thiocyanate ions that have been put in our saliva secretion kill the bacteria in your mouth by breaking them apart. In addition, lysozyme enzymes attack and kill bacteria in your mouth while digesting food remains to prevent the bacteria to feed and reproduce. Hungry bacteria perish more easily. Our infinitely merciful Lord put special proteins called anticorps in our saliva to prevent many diseases that can enter from the mouth before they develop. These anticorps act like special agents that attack and destroy bacteria. If we don’t secrete enough saliva, ulcers will develop in your mouth frequently. If they last long enough, they will get infected and also cause tooth decay.

The control of our secretion is connected to an area that includes the appetite center in the brain stem through the involuntary nervous system. When you smell or taste foods you like, we immediately start secreting saliva as a reflex. When you come across foods that you don’t like, or when you get scared or excited, we slow down saliva production, again reflexively. Suspects in the past used to be given a handful of rice to swallow, with the thought that the real culprit would not be able to swallow them, because the excitement caused by the feeling of guilt would cause his/her mouth to dry.

Diabetes, which is a systemic illness, also has a negative effect on our functioning. Diabetes presents itself with drying of the mouth, along with excessive intake of water, and the frequent need to visit the restroom. One type of rheumatoid arthritis may also cause dry mouth and dry eyes together with joint pain.

As you see, Peter, I’ve briefly explained to you how invaluable and necessary your saliva is. I have not even mentioned our histological and anatomical structure, which resembles a bunch of grapes. I believe you can imagine how each and every one of my gland cells is like a perfect biochemical factory. You wouldn’t relate all these to your mouth being wet for no reason, would you?

Irfan Yilmaz is a professor of biology in Dokuz Eylul University, Izmir, Turkey.

We agreed with the other organs to explain the splendid art inherent in us to you; we have patiently waited our turn. Our aim is to remind you to look after yourself so you will continue to live a healthy life and consciously perform your duty of servitude to our Lord Who created us. In addition to your perfections, as human beings you also have certain faults, such as being negligent, deceptive, or forgetting easily. Even if you realize that these are your faults, each bears a distinct wisdom in terms of Creation. If from time to time you can succeed in avoiding this negligence and escaping these experiences by using these shortcomings as a springboard or platform from which to depart, you will be able to reflect and contemplate on the attributes of God with greater admiration.

Indeed, we are just inside the gateway of the body that opens to the outer world, the mouth, an area through which the various substances you eat to stay alive pass through the mechanic process we implement before actually entering the body.

When food first enters the mouth, it is passed through a grinding process that carries out a mechanical breakdown before the chemical breakdown in the stomach and intestines. We teeth are aligned along on your lower and upper jawbone. When you were only a two-month old fetus, the Creator Who is aware of the importance of our tasks began to prepare us, and we were planted, just like a seed sown in the earth, in the crevices in your jawbone, and concealed by your gums. But still, we do not appear immediately after birth, because we may hurt your mother when she is nursing you. Initially, it is necessary for you to be fed with that unique nourishment, your mother’s milk. However, we begin to gradually emerge in the form of tiny stumps while you are still being nursed by your mother, when you are around six or seven months old.

We were created to cut, chew, and grind food of various textures and hardness. The number and mechanical functions of my colleagues, who have names such as incisors (cutting teeth), canines, premolars, and molars vary. The incisors, which are at the front, begin to appear when you are still only 6–8 months old, the ones immediately beside them erupt when you are 8–12 months, the premolars appear when you are 12–16 months, the canines at 16–20 months and second premolars when you are between 20–24 months old.

During this period, we are known as the milk teeth. When you are 6–7 years old, the molars emerge and then when you are 7–8 years old the central incisors appear; between 8 and 9 years of age the lateral incisors, between 9 and 11 the first premolars, between 11 and 13 years the second premolars and the canines, and finally between 12 and 14 years of age the second molars erupt; the third molars, known as the wisdom teeth, usually appear any time between the ages of 17 and 40, although sometimes they do not come through at all. The two front incisors, the canine beside them, and the two premolars and three molars, that is, a total of eight teeth, constitute half of the jaw, but all the teeth work as a team of 32. Sometimes you may hear about humans who perform various experiments regarding our strength. My strongest chewing force was recorded as 1900 Newton. In a demonstration of strength, a human was capable of lifting a weight of 620 lb as high as 7 inches from the ground. Although each of us has different functions and appearances, in terms of where we are situated, in general our anatomic structures are the same. The enamel layer covering me is very hard and shiny. My enamel layer is even stronger than bone. My sections, which cut hard substances you put in your mouths like knives without bending, are in fact covered in enamel. Beneath the enamel surface is a solid, bone-like substance known as dentin, which has a slightly different composition than that of the bone found in other parts of the body. The space in the center of this layer (known as pulp chamber) is filled with blood cells and nerves that nourish me. The section of each of us that is buried beneath the jaw bone is called the root, while the part that is visible and which you brush daily is called the crown. Throughout your lives, everything you put in your mouths, whether it is hard, soft, corrosive or acidic, comes into contact with the crown. Some substances can damage us. Even stone or steel would not be able to withstand the conditions that we teeth are exposed to. Although made of metal, a carpenter’s saw becomes blunt, and even a blacksmith’s grinder looses it effect after a while. But if you take good care of us, we will serve you throughout your entire life. Unfortunately, I have noticed that you do not take care of us at all. You eat sweet things, but you do not clean us, you eat meat, but you do not brush us, you relentlessly use us to crack open nuts, and pour anything you find, whether hot or cold, over us. We can withstand this for now because we are still young, but it is impossible to say how long we can carry on like this. If any of us cracks and bacteria begins to eat away at us, eventually causing us to decay, you will start to complain, but it will be too late.

The Prophet Muhammad, peace be upon him, gave utmost importance to us in his daily life. Whenever the opportunity arose, after eating, before prayer, in the morning when he woke up, the Prophet constantly used a miswak, a cleaning twig, and cleansed us with affection. This is why we sparkled like pearls when he opened his mouth or smiled, and those close to him never sensed an offensive odor from his breath. But many people today do have bad breath because they neglect us. Not only does the smell of bad breath make others uncomfortable, but you are also causing harm to yourselves. After the bacteria that hides in the crevices on and between us makes a hole through the enamel and the bone beneath it, this bacteria then begins to spread to your entire body through the blood cells in the pulp chamber, causing damage to other organs of your body. These bacteria can damage vital organs, such as the heart or the kidneys. At first, you do not notice this, because this occurs over a long period. But these bacteria can gradually destroy many of your organs. When you do finally realize what has happened, it could be too late; your cardiac valves may have stopped working properly, or the filtering function of your kidneys may begin to fail.

If you begin to lose us one by one, initially you will notice the change in the taste of your food, then defects in your speech, and eventually you will notice facial deformities and sunken cheeks. You will have to make dentures at great expense, and only in this way will you be able to restore your appearance; but in terms of function, you will never be able to substitute us with those artificial dentures!

You know that one of the main characteristics that distinguish us from animals is speech. Although the focal point of speech is in the brain, speech actually emerges as a sound or words with the collective assistance of many other organs. These are mainly the lungs, the larynx (voice box), the ears and the tongue; but we too play a big role in the correct pronunciation of many letters and words.

In addition, the mechanoreceptors in us and the cell network in our roots display such perfect precision that when we chew, we do not bite your tongue or cheek. Therefore, you can adjust the force of biting pressure for substances of various textures. If these receptors and cell network did not exist, you would use an identical chewing strategy for eating substances as hard as an apple or as soft as pudding. In which case you could not bite an apple or you would attempt to eat pudding with excessive pressure, causing us to grind together with unnecessary force, even breaking us.

So you can see that nothing has been created without a purpose. Are there any unnecessary details in creation? Of course not! This is impossible; as the eternal wisdom and power of He who created us would never permit something which is deficient or of no purpose..!

Dear Peter! I think this should be sufficient in describing ourselves to you. Naturally, the food we breakdown is not in a condition to be swallowed immediately. Therefore, our neighbors, the salivary glands can explain what happens next…

Irfan Yilmaz is a professor of biology in Dokuz Eylul University, Izmir.

Dear Peter, in your body, which is built like a well-functioning factory, I am the most essential sanitary device. As the heart pumps blood to take food and oxygen to all your organs, you obtain the energy you need. But do you ever think about the disposal after so splendid activities are carried out in your body? If you burn a stove, you need to dispose of the smoke and the ashes if you want to keep it working. Likewise, as you burn your calorie intake, you dispose of the smoke (carbon dioxide) with your lungs and the waste with nitrate-poisonous after a certain level of intensity-thanks to my quietly and perfectly working filters. That is, I am an organ which saves your life by removing the poisonous substances in your blood. I do not only filter your blood, but also play a role at controlling the balances of the sensitive levels of water, sugar, amino acids and different minerals in your body. In short, I am a tiny but strategic laboratory.

The acid-base balance in your body and the amount of water and different salts are significant values which concern all of your bodily activities. When their balance is upset, different troubles arise in different units of your bodily mechanism. I am such a blessing, which works so sensitively to adjust the levels of water and mineral salts in your body while you don’t even realize it.

A watery environment is needed for the thousands of biochemical activities taking place in your body. In addition, activities like the contracting of the muscles and transmission of electrical stimuli between your neurons are realized with the presence of a pinch of mineral salt you don’t even give a thought about. Sometimes you sweat due to running or hot weather. The white stains on your shirt are the salts you lose after the water evaporates. When you suffer from diarrhea, you lose salt again, for the salt in the nutrients are thrown out without being absorbed. Especially when little children are concerned, this loss is of vital importance. The transfer between the blood and the liquid in the tissues is mainly realized through the concentration differences which are kept in a certain balance. If your body holds too much water, your tissues swell. You particularly feel it when you press your finger over the flesh near your shins.

Dear Peter, I will not list all of my duties in detail in order not to confuse you. However, let me tell you one more. Since not everyone knows this duty of mine, they just see me as an organ of liquid disposal. But I also take part in controlling the blood production! Surprised? Well, I also have the duty of secreting the hormone which stimulates blood production in the bones. I must always stay alert and maintain this balance in the best way; if you start losing blood, for instance, I must increase the hormone and accelerate blood production.

Yes Peter, I’ve told you about a few of my basic duties, but haven’t told you about how wonderfully designed I am. I am a bean-shaped organ and a single kidney like me weighs 130-160 grams on average. We are approximately 10 grams lighter in female bodies. I am surrounded by a soft but protective membrane. I need 35 grams of daily oxygen supply to survive and I use 13 % of your total body energy.

As an army is made up of individual soldiers, I am like a complex army, and a single soldier of mine is called a “nephron,” which does the real job. Thus, you can see me as a body of nephrons. Millions of these nephrons are brought together to make up one kidney.

A single nephron is a thin tubular structure with closed ends, and its length is about 3-4 cm. So the total length of my nephrons is about 50 km. The cup-like sac at the beginning of a nephron is named the “Bowman’s capsule.” The main artery bringing blood to the kidneys branch into smaller units, and one road leads to every nephron. The knot of capillaries (glomerulus) inside this double-walled capsule is more complicated than any road map you might have seen. The total length of the capillaries is nearly 25 km. The unwelcome substances in the blood are passed to the capsule thanks to blood pressure, and they proceed through the tubule. The total surface area of my tubules is about 20 m2. Within five minutes the whole of your blood passes through us. That is to say, an average of 1.2 liters of blood per minute, and 1800 liters a day are filtered by my nephrons, leaving the toxic substances in me. As this amount of blood (nearly 400 times the normal amount in your body) pass through my tubules and return to the veins they leave behind an average of 180 liters of liquid in me. In this case, you could be supposed to throw out 180 liters of urine a day. However, if you really did that, you would neither be able to find a sufficient supply of water nor salt. Fortunately, Providence granted you the mechanism to absorb back nearly 178.5 liters of this filtered substance. This way, the thickened urine throws out the toxic nitrogen-containing byproducts together with a little amount of water. Therefore, I give you back the substances you need with an amount of 1.5 liters of liquid disposal a day. This reabsorbing is realized in what you call the Henle loop. The cells in the walls of my tubules have neither intellect, nor consciousness, nor any knowledge of physiology; in spite of this, they work as if they were perfectly aware of their duty to adjust the amounts and types the substances to be kept or released. To give you an idea, you can think about the huge dialysis machines your engineers design to fulfill the job my tiny tubules do. You decide which one of us is the perfect work of engineering.

A rich network of veins surround the Heinle loop and the reabsorbed substances are released into the bloodstream. The drops to be disposed of are collected and then passed to your bladder. When the liquid in your bladder amounts to a certain value it tightens the bladder walls. The muscles blocking the way out give way and the urine is disposed of. However, know that the bladder has the capacity to expand as large as 1.5 liters when you cannot find the proper time and place.

Peter, most people take for granted the blessings they enjoy. If you visit the nephrology service in a hospital and talk to the patients waiting to be dialyzed, you understand what I mean better. Do not forget that many people who suffer from kidney failure need that huge machine to filter the whole of their blood and they pray for a kidney suitable for transplantation to be found at once.

Incidentally, thinking of chronic kidney failure recalled various reasons which ruin me: long lasting infections, long-term use of certain medicine, different chemicals like ethylene and mercury, heavy loss of blood, high blood pressure, serious burns, and wrong blood transfers etc. In such cases I can receive irreparable damage.

Another issue which troubles me is the formation of kidney stones. The stones which form owing to failures in different metabolic processes really hurt. When excessive decrease of liquids or increases of salts in the body upset my sensitive balance, some dissolved substances remain, begin to collect, and form stones. These stones hinder urine flow and might cause infections. You may drink water abundantly to prevent these stones. Most importantly do not wait too much before going to the toilet. If you excuse me, I also strongly recommend you to urinate in sitting position; this helps emptying your bladder completely and reduces the risk of kidney stones.

I do my job properly until I lose 90 % of my working capacity. When a considerable part of me loses its capacity, the remaining good part boosts its activity to make up for the loss. When one of our twins are taken out with an operation, the other one does not complain at all; it grows a bit bigger and keeps working.

As the nature of honey depends on the nectars bees collect, the ingredients of the urine I produce depend on what’s in your body. Therefore, a urine analysis tells much in the case of illness. For example, I normally do not release valuable substances like glucose and protein in your blood into the urine, but return them to the bloodstream. As my friends cannot fulfill this function in diabetic patients, their urine analyses reveal glucose. As for medicines, I throw them out right away since they are alien substances to me.

Peter! You are young and healthy but be careful and do not get cold around the waist, otherwise I might trouble you. There’s a lot to tell you Peter, but I do not want to confuse you. Like any other organ, I do not like being taken for granted and I just wish for you to appreciate what a blessing I am. Let me note that my perfect cooperation with the rest of your body is another wonder in itself. Anyway, the urea in your blood is increasing, so I must go help my twin now. Goodbye Peter!

Irfan Yilmaz is a professor of biology at Dokuz Eylul University, Izmir.