One of the processes that occurs in the body is called “inflammation.” Inflammation occurs when a cut into the skin also punctures a blood vessel. This situation directly exposes the blood to the air. Inflammation occurs in a few steps. First, the blood vessels near the wound are expanded (which causes the swelling that we see near the cut) and special proteins called “fibrins” are brought in. These fibrins bind to each other to form a net-like structure. We are all quite familiar with this net, which we call a blood clot. This net stops the bleeding and cuts the interaction between the air and the blood within a few minutes.

Next, it is time to quickly eliminate any foreign objects that got into the tissue. Special immune cells called “macrophages” are sent to the crime scene to clean up. Macrophages are large white blood cells that “eat” microbes and other foreign objects using a process called “phagocytosis.” After the scene is all cleaned up, these macrophages excrete special molecules that induce tissue repair and return the blood flow to normal. An important note here is the specific order of these events. Like every single process in the body, they occur in the most purposeful way possible. What do I mean? I mean that, first the wound is closed urgently; second, macrophages are sent in; third comes the tissue repair. Any other order would have greatly lowered the effectiveness of inflammation. Imagine that the wound is closed after the macrophages are sent in. Then, by the time the macrophages killed all the microbes, twice as many would have entered the scene. The body seems to know every single event beforehand and plans its defense accordingly.

Our body is perfectly calibrated to keep our blood, the milk of our organ systems, absolutely pristine.

Let’s say a microbe managed to sneak into the blood before inflammation occurred, and is long gone to another region of the body. Does the microbe win? Unfortunately for the microbe, it has to pass another test. This time the tester is the lymphatic system. The lymphatic system is the sewage system of the body. When the blood transfers its nutrients to the tissue, the fluid goes through the “interstitial area” (the empty space between organs). During this process, some of the fluid stays in this area and starts to accumulate. This is where the lymphatic system kicks in. The lymphatic system consists of many tubes running parallel to the blood vessels and recollects any excess fluid and transports them to the subclavian vein near the neck. This way, excess fluids of the body and all of the molecules in them, are reintroduced into the circulation. If there is a problem with this process, an abnormality called “edema” occurs. Of course, the blood is a very sensitive fluid because it travels through the whole body and seeps into almost every single cell. If a microbe were to get into it, it would easily spread and cause disease. So, the lympatics first does a checkup on the body fluid. This checkup occurs at special nodes in the system called lymph nodes found all over the body. Two of the most famous lymph nodes are the spleen and the tonsils. Within these nodes are lymphocytes, special immune cells that “tag” bacteria and other microbes to be later destroyed by macrophages. Thus, the blood is continuously cleaned and kept safe from harmful microbes.

Last but certainly not the least, the final inspection the blood goes through takes place in the kidneys. The aforementioned two checkpoints prevent the entrance of any foreign materials into the blood, and the elimination of any microbes lucky enough to somehow make it through. So, the only task to be completed is the elimination of excess molecules formed in the metabolism. For example, the blood in the veins (the vessels that carry carbon dioxide formed by the respiration of cells) is carried to the lungs where the carbon dioxide is exhaled. But, a much more precise mechanism comes into play in the kidneys. Blood vessels that come from all around the body form a knot-like structure in the kidney called the “glomerulus.” This knot-like shape increases the surface area of filtration. The blood running from the glomerulus is then filtered into the “Bowman capsule,” which surrounds the glomerulus.

But wait! The sanitation system is not satisfied with this first filtration and “thinks” that the filtrate is not ready to be excreted by the urine. So, a more delicate filtration occurs right after the filtrate enters the “proximal tubule.” While passing through this tubule, essential molecules are immediately reabsorbed into the body. The most valuable of all these molecules is glucose, since it is the main source of energy in the body. The proximal tubule reabsorbs around 98 % of all the glucose, while the distal tubule scouts out the rest. After the tubules are done with the filtration, not a single glucose molecule is left in the urine. As a matter of fact, the presence of even a few glucose molecules in the urine leads to a diagnosis of “renal glycosuria.”

After the proximal tubule, the filtrate goes into the “loop of Henle,” where it is dipped into a high-concentration environment. Water travels passively (without the need for energy) from low-concentration to high-concentration areas. In the loop of Henle, the urine is low-concentration, so water runs back into the body. Thus, any excess water in the urine is effectively and economically reabsorbed. The big machine that consists of the glomerulus, the Bowman capsule, the tubules, and the loop of Henle is called a “nephron.” Everything described above occurs in a single nephron. The average number of nephrons in one kidney is around 1,000,000. The human bladder holds around 150 ml of urine on average. So, each nephron is actually responsible for 0.00015 ml of urine production. The kidneys filter over 1,000 liters of blood each day, so our blood is kept just as we want it. Millions of tiny nephrons work in unison to take in huge amounts of blood and they know exactly what to leave and what to keep, 24 hours a day, 7 days a week.

Our blood is our life source. It is the milk of the organs, and our organs would dry up without it. Believe it or not, our organs are quite picky. If they are to receive anything they don’t like, they will start acting up. In order to keep the organs happy, the three mechanisms mentioned above have to work hard and not make a single mistake. These mechanisms are, of course, also made up of cells. These miniscule cells “know” exactly what their clients on the ends of the body like and don’t like, and prepare the blood composition accordingly. Only one word can describe these wondrous mechanisms: Impeccable.

Brian Turk is a medical student from New Jersey. He writes on medicine, health, and biology on a freelance basis.

I am sorry, give me a minute.
…

You see, I easily lose my head. So, I need to use medications to balance my mood. Oh my God! That was supposed to be a secret, and it just slipped from my mouth to an admirer. Look, I suspect that once you learn my most-hidden aspects, my reputation with you will be ruined, and you won’t love me anymore. And it really distresses me to have failed your high expectations of an equation like me.

Nevertheless, it is such a heavy burden to suppress one side of mine while constantly showing the other. Yes, being an equation, I am well balanced and very clear about my views. I am one of those lucky theories that have a sound mathematical foundation, and this is why even the psychologists could not suspect a grain of problem due to my childhood. But I am telling you: I am bipolar….

Well, wait a minute! Who are you, and why would I share my secret with you? Go away with your own business, and leave me alone. I mean, I don’t want to disrespect you, but this is my private life, you know! …

No, no, wait, wait… Give me a second… Let me take my medication!

I know it sounds ridiculous if an equation complains of a disorder. How can you be an equation if you have a disorder, and how can you be in disorder if you are an equation? Well believe it or not, that’s exactly what I have been suffering from for such a long time. I am both orderly and disorderly; just like light is both wave and particle at the same time….

Hey, why are you looking at me like that? I told you to leave me alone. It was you who insisted on waiting and learning my secret. I don’t care if your designs are ruined or whatever. Actually, I’m the one who should be blamed. Why did I trust a person whom I met just a few minutes ago? I am like a fish that is eager to eat the worm on the hook. Such an idiot, I am…

Hello? Are you still there? I think I am losing my head again. Where are my pills?

Look, this is not easy for me to do, because in my routine life, people are obsessed with my equation aspect. And, they are passing this obsession from generation to generation. Every time I meet a young brain, my dream to finally meet an unconditioned mind fails. I am always too late to reach the fresh and eager minds. People always manage to find them before me, and instruct them to treat me as a well-established equation. No matter how much I want to show otherwise, they refuse to see my imperfect side, even if the experiments hit them in the face.

Why do they keep doing it? Much like a missionary, they are converting people into the belief of the Bernoulli Equation. I am telling you guys: I am bipolar, and I have imperfections, too!

What am I doing?! You are not going to believe me anyway. I am telling you my deepest secret, and making myself vulnerable as can be, but I still can’t wake you from a dream. You don’t want to wake up anyway; why would you? Do you have any other theory to believe in? Do you have another equation with which to orient yourself in an ocean of unknowns? Go on with your sleep, have nice dreams…

Unfortunately, I don’t have the same luxury as you. My continual tumbling between the two aspects of my reality never allows me to dream… Sometimes, I feel so energetic, so elated. I feel part of everything in the universe, and fall into an ecstasy by realizing that I contain everything in me. And the flow of time stops; we all become one and at peace with each other. No need to rush anywhere, no need to do anything… Just be…

But then my other side kicks in. I feel depressed under the burden of my duties and deadlines. I find myself in an ever faster pace of life, where there is no time to “just be”. There is always an action being commanded; there is always a motivation behind exchanges with others. The universe appears to be made of distinct individuals, like broken pieces of glass. Each is headed to a target of its own, unaware of any union. When life is filled with such a merciless momentum, what is more meaningful than getting rid of my life altogether?

Then, in that gloom, as my dizziness fades, my energetic side starts shining. By virtue of having been created in the same story, I focus on myself to read the universe. I realize that I carry the traits of anything and everything else around me. Once again, I start breathing the life that is gushing forth from me.

As I lose my conscience by getting high in life, I get stuck with the fact that losing my conscience defeats the purpose of being whole. You cannot hold onto the entities whose existence you fail to recognize. I start criticizing myself for disrespecting those around me. I blame myself for being such an addict and a loser; the shame of creation…

You see, there is no end to my ups and downs. As a remedy to these continuous head losses, I am using medications, but they have side effects. I am constantly growing fat, and losing my beauty. I hope one day, someone is going to be inspired with another equation that can take over my duties. Then I can retire from this bipolar life, and be mentioned in the scientific stories as a respectable grandparent…

The Bernoulli Equation given in its simplest form contains a pressure term (P) and a velocity term (1/2 (pV)^2), the sum of which is constant along a streamline:

P+1/2 pV^2=P_0

Thus, pressure and velocity work inversely with each other. As one increases, the other decreases.

The Bernoulli Equation can be derived in two independent ways. First, one can start with the conservation of energy (1st law of thermodynamics), and then follow some assumptions to end up with the Bernoulli Equation. Energy has a scale but no direction, and can be transformed from one form to another. Therefore, everything in the universe can essentially be converted into each other, just like the pressure and velocity terms in the Bernoulli Equation.

The second way to reach the Bernoulli Equation is based on the momentum equation (Newton’s second law). Again using few assumptions, one can achieve the nice and simple Bernoulli Equation. Unlike energy, momentum has both scale and direction. Any changes to this directionality require a forceful interaction between two objects.

Having its base on two fundamental laws of physics, hence reflecting both energy and momentum, makes the Bernoulli Equation one of the strongest and most beautiful equations of science, but not perfect!

The underlying theory of the Bernoulli Equation requires that the density (p) of the fluid be constant – in other words, incompressible. Therefore, the Bernoulli Equation fails to accurately explain the flow of gases at high speeds, which involves density changes. Similarly, the effects of viscosity are neglected in the foundations of the Bernoulli Equation. This means that the variation of pressure and velocity near a solid object cannot be explained by the Bernoulli Equation.

As a result of these imperfections, the Bernoulli Equation describes a fluid as a pile of metal sheets, and explains a flow as the sliding and bending of these metal sheets around each other. Clearly, this is not what a fluid is and not what happens in a real flow. Therefore, predictions of the Bernoulli Equation are inherently wrong, especially when there are sharp turns or obstructions in the way of the fluid.

In order to compensate for some of these deficiencies, a concept known as head loss (hloss) is introduced. Head loss is experimentally measured and then artificially added to the Bernoulli Equation, which then becomes:

P+1/2 pV^2+pgh_(loss,turns)+pgh_(loss,obstructions)+pgh_(loss,wall shear)=P_0

The final result is an equation that is useful but repulsively oversized, and it is certainly not well-established in theory.

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.

The 300 to 500 sperms which strive to enter into egg meet with the cell layer (corona radiata) which is being serially positioned around the zona radiata. A liquid is secreted from this zona radiata which punctures the euchromosome¹ placed on tip of sperm. Each of various enzymes set free following the puncture of euchromosome is assigned to overcome a separate obstacle before the sperm. Duty of the hyaluronidase enzyme, for instance, is to puncture the outer cell layer (corona radiata) which is assigned to protect the egg. Resultantly, the sperm passes through this cell layer and sticks onto the zona radiata (zona pellucida). The quasi-trypsin dissolutive (proteolytic) enzymes are employed for overcoming the zona radiata. Only one or rarely two of the few sperms which stuck onto this zona radiata manages to penetrate into the egg. It has been estimated that plurality of sperms around the egg, contrary to their rarity, facilitates their entry into the egg.

The sperm penetrates into the egg with its tail but tail membrane stays outside. The protective membrane of the ovum (zona pellucida) starts diffusing calcium within the very first minutes of sperm’s penetration and resultantly, granules are released, receptors are exterminated and the egg becomes structurally transformed. Consequently, a thick layer is formed over the protective membrane (zona pellucida) for prevention of penetration of another sperm.

Following the sperm’s penetration into egg (cytoplasm), the “fusion” process starts. Fusion is the unification process of sperm and egg cells (pronuclei) each of which are separately containing 23 chromosomes. Thus, construction of a genetical library which is containing 46 chromosomes and being prerequisite of formation (creation) of a new human baby is completed. Afterwards, the first mitotic division gives way to a double-celled zygote and the embryo starts forming while settling into the secure base of the uterus. As the outcoming child is going to be a mixture, i.e., a genuine and particular blend of the genetic codes available in the inherited gene pool, he/she will have resemblance to his/her parents and thus to their reciprocal kins (paternal and maternal grandparents, uncles and aunts and etc.).

Prophet Muhammad and Genetics

Prophet Muhammad, peace be upon him, pointed in his various sayings and explanations to the fact that the baby in mother’s womb carries a number of genetic features (characteristics) which are being inherited from the parents:

When a Jewish person asked Him, “what is man created from?” he replied: “Man is created from a blend (mixture) of zygotes of both man and woman.” Then the Jew said: “Moses as well said the same before you.”²

Prophet Muhammad, peace be upon him, also shed light onto the fact of resemblance or inheritance of character by way of genes:

“Is bathing a must for women?” asked Umm Sulaim to the Prophet.

“Yes, it is a must when her seminal fluid outflows and seen,” he replied.

“Do women have wet dreams?” she asked.

“May God grant you goodness! How otherwise a child resembles to his/her mother?” He replied.³

….

As seen and understood by His above hadith (saying), He who was the great teacher of mankind was the first person who said that women do also see wet dreams.

He has also been the first person who articulated the concept of “dominancy,” which was not understood before 1850s.

He said:

“The child resembles to either side of the parents whose seminal fluid comes to the fore and surpasses the other’s in mother’s womb during the intercourse. If there is an equilibrium, then, resemblance is also in equilibrium for both sides.”⁴

“If, during the intercourse, seminal fluid of the man precedes and surpasses that of the woman, then, the child resembles to the father, and if semimal fluid of the woman precedes and surpasses that of the man, then, the child resembles to the mother.”⁵

“If seminal fluid of the woman surpasses that of the man, then, the child resembles to his/her maternal uncles, and, if seminal fluid of the man surpasses that of the woman, then, the child resembles to his/her paternal uncles.”⁶

In another one of His sayings, He points out to the fact that the recessive characters (features) in the grand ancestorial gene pool would dominantly and collectively emerge after following a couple of generations:

“A man having a blackish baby boy approached and said to the Prophet:

“I am suspecting my wife.”

“Do you have camels?” the Prophet asked him.

“Yes,” he replied.

“Then, how are their colors?” The Prophet asked.

“Red.”

“Is there any one with grey color among them?”

“Yes, there is.”

“Then, where did this grey color come from?” asked the Prophet.

“Presumably from a line of its ancestors,” the man responded.

“Here you are! This child of you is also presumed to be coming from a line of your ancestors,” the Prophet told the man.⁷

Dr. Arslan Mayda is a medical doctor at Sifa Hospital in Izmir, Turkey.

Notes and References

1. An euchromosome zone enriched by lysosome enzymes is noticed on stem of a mature sperm cell. The lysosome enzymes penetrate into the egg cell and impregnate it.

2. Ahmad Bin Hanbal, Aynee, Ramouz Al Ahadeeth, Kanz Al Ummal, Jami’ul Saghir

3. Bukhari, Muslim, Abu Dawoud, Aynee, Ahmad Bin Hanbal.

4. Muslim, Ibn Majah.

5. Bukhari, Ahmad Bin Hanbal.

6. Bukhari, Muslim, Abu Dawoud.

7. Abu Dawoud, Muslim, Ahmad Bin Hanbal, Ibn Majah.

I am placed inside your chest cavity as two air sacks-or bellows-surrounded by your muscles. I took my first breath right after birth and I still keep working non-stop. Even while you are sleeping, I fulfill my function with the automatic command I receive from the respiratory center at the back of your brain. My close friend Heart started working even before me while you were in the womb. I was resting then; actually I hadn’t even formed fully. As all your needs like food and oxygen were met in the body of your mother-whose heart you occasionally break-I didn’t have to make extra effort to get air, being filled and emptied. Even if I had attempted to do so, I would have had no chance of succeeding; since you were contained in the amniotic fluid, an attempt to breathe could have caused you to drown.

The first breath I take after birth is critical and rather difficult, since the windpipe is still much narrower than normal. On the other hand, the number of my alveoli where oxygen exchange with the capillaries is realized is so high in relation to body size that it balances the situation. When I make my first move and fill with air, I put pressure on the arteries and veins. Then the vessel directly connecting my artery to my mother’s aorta is dismissed, the curtain between the valves is closed and the blood circulations are separated. If this curtain is not properly closed and a gap remains in between, the oxygen-rich blood and the used-up blood mix and result in the disease known as cyanosis-or “blue baby” syndrome. As these two kinds of blood mix, the tissues are not supplied with sufficient oxygen and the white parts of the skin and eyes assume a bluish appearance.

Turning blue-purple due to lack of oxygen in the tissues is the same for smokers. Cigarettes-my archenemy-contain hundreds of toxic substances, such as carbon monoxide, which combine with the hemoglobin in blood and prevent oxygen transfer. Therefore, the lips of smokers turn slightly purple. You need to be careful with the air you inhale. The windpipe which brings air into me is covered with a ciliated epithelial tissue which catches the dust brought along and sweeps it outside. While you are asleep, the vibrating cilia of this sweeper work throughout the night and in the morning you get rid of the outcome of their propulsion by clearing your throat. However, every draw of a smoker kills 800–1,000 of our ciliated epithelial cells. After some time, they become unable to sweep the toxins (carbon, sulfur, lead, etc) inhaled with the air. I can’t stand it anymore! The increased air pollution is already putting enough strain on us… this habit is just too much for a lung to handle! It is just… an open invitation for cancer! Sorry, Peter, I didn’t mean to be rude. I appreciate that you don’t smoke, but I wish those who do would realize how splendid a mechanism they are destroying.

Now let me tell you about what a work of art I am. As you also know, art in a structure becomes more meaningful with functionality. As is the case with my other friends with which I work in your body, I am perfectly made to fulfill my duty. In other words, never mind forming an organ like me as a consequence of molecules and cells accidentally coming together, even a single protein molecule in my structure does not come to existence through unconscious causes.

With every breath you take, the pressure of the oxygen within the air inhaled rises, so it passes through my membranes by diffusion and into the adjacent capillaries; there it combines with hemoglobin molecules. At the same time, the carbon dioxide passes through the same membranes into me, and I dispose of it. Both of these are easier said than done! You breathe 13–14 times a minute and the whole thing is repeated over and over. As I keep expanding and contracting during breathing, which you are unaware of most of the time, first of all I need to be very flexible. Together with this flexibility, my most important quality is having the largest possible surface area within the smallest volume. My surface area of around 100m2 (as large as a tennis court) is made to fit into your chest cavity in the form of thin membranes so that my large surface allows gas diffusion. These membranes need to be kept wet; a special fluid is secreted as a precaution and respiration is realized smoothly. Without this fluid, my membranes would just stick together, unable to carry out their duty.

You can compare the course of the air inhaled to that of a car passing from a highway onto increasingly smaller roads and in the end reaching a dead end in the small sacks named alveoli. The air coming in through the mouth and nose unites at the expressway named the trachea, or the windpipe, which is 15cm long and 2–3cm in diameter. Incidentally, I have a couple of things to tell you about the way you breathe. As a matter of fact, inhaling is the duty of the nose. I’m sure it also has a lot to say as well, but let me just mention a simple fact about it. Now, you should inhale through your nose, so that the air you take in gets warm, wet, and is cleaned from dust. If you try to breathe this way, you do not trouble me much, and reduce the risk of catching a cold or an infection of upper respiratory system. Inhaling through the mouth helps dust and germs get into me and you might contract various illnesses from bronchitis to pneumonia. Now you know why kids who have adenoids who sleep with their mouth open get ill so easily. Sorry, I couldn’t help speaking on behalf on the nose.

Well, what were we talking about before that? Oh yes! The ways through which the inhaled air passes. As the name suggests, the windpipe which makes the air reach me is a cylindrical tube surrounded by 16–20 cartilaginous rings. As it is placed beside the esophagus, one side of the rings is made of soft cartilaginous tissue instead of hard, so that they don’t hinder swallowing. The muscular tissue near these rings helps them widen and narrow during respiration or coughing. I sometimes warn you by making you cough. Maybe it seems to be a disturbance, but if I don’t push out air by coughing through the contracted windpipe, contaminants can clog me up and cause you to suffocate. Therefore, the burst of air-what you call a cough-is a great blessing to you.

The sound system at the tip of the windpipe is another wonder. The used air I send out vibrates the cords in that voice-box and produces such melodies, gives voice to such speech! The air divides into the two lungs. My two sides are not symmetrical; the one on the right is divided into three, and the one on the left into two. I think this was meant to make room for the neighbor on the left, the heart. In addition, if there’s any cancer growth in me, the diseased part can be taken out by an operation and I can keep on functioning. God knows the wisdom behind this form. After that, these main bronchi separate into 8–10 thinner branches, like highways connecting to narrower roads. This branching resembles a tree turned upside down. At the tips of these thin branches are the respiratory bronchioles resembling clusters of grapes. The small spheres which make up the cluster are the end of the road and are the most vital parts. These spheres named alveoli are made of very thin membrane and they are surrounded by a net of capillaries (picture 5). These are the functional spots where gas exchange is realized.

I hang in the thorax with veins and arteries all around. There are two layers of protective membrane over me. One of them is stuck on me, whereas the other is stuck on the ribs which form the chest cavity. There is a fine and slippery fluid in between these two layers and it neutralizes the friction every time I inflate and deflate. If it hadn’t been placed there, I would wear out and be damaged. As I inflate during inhalation, the chest cavity should expand simultaneously to make space for me. If it weren’t given a flexible form, I would fail to breathe and you would eventually die. Fortunately, the protective set of ribs and their connection with the spine are flexible enough to make me work comfortably. In addition, the dome-shaped muscular partition (diaphragm) separating the thorax from the abdomen contracts and pushes down the organs in the abdomen. Thanks to the simultaneously programmed movement of both the ribs and the diaphragm I inflate with air and expand.

Being in constant contact with the outer environment makes me susceptible to various diseases. Coughing is among the foremost signals I give in the case of disease, and sometimes-excuse me-I produce a mixture of blood and phlegm. Also, I may have difficulty in breathing and warn you with chest pain. You should be alert to my signals. If bacteria and viruses infect me, they might reproduce inside my air sacs, and cause stiffening and suppuration.

I am particularly sensitive to allergic disorders. When the straight muscles on the walls of my bronchi contact an alien substance, pollens for instance, the consequent histamine secretion makes my muscles contract. In addition, allergic diseases, which can affect blood vessels, affect me a lot since I happen to be one of the major organs contributing to blood circulation. As a result of the contraction of my bronchial muscles and difficulty in disposing of the mucus I secrete to defend myself, I have trouble with breathing-you call it asthma.

In addition to this, we can mention diseases like emphysema, acute or chronic bronchitis as problems I frequently face. Even your anger has a great impact on me. Breathing becomes more difficult immediately.

Peter, I’m sorry, it is not possible to summarize a work of art like me within a few pages, but I need to stop now… but please, keep away from polluted areas and cigarette smoke! Send me as much fresh air as you can. And even though you mostly take me for granted, like my other teammates, please reflect upon what a blessing I am.

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

The role of mathematics in understanding nature

Mathematics is a discipline of thought. It helps to develop our way of thinking and is an exercise in improving our intelligence. Mathematics can be considered as another kind of language, a language very different from that of a spoken language. When it is hard to convey our thoughts in terms of words, or our words become insufficient to express our thoughts, mathematics may be used as an alternative. On some occasions, expressing ideas via mathematics might be more concise, much clearer and more understandable. Although mathematics is considered to be a separate branch of science, in fact it is related to all branches of science. Nowadays, even in biological and social sciences, extensive studies are being conducted using mathematics.

Engineering was one of the earliest application fields of mathematics. It has strong links with mathematics as well as physics. Many engineering problems can be considered as an application of mathematics and hence applied mathematicians and engineers share common research areas. Engineers try to improve the quality of life by designing new products and in the design process, geometry and mathematics play a vital role.

Since the first day of existence on the world, mankind has tried to understand and formulate the surroundings and events that take place around them. They have investigated the world and the cosmos and accumulated knowledge. Each question that was answered yielded more questions to be answered and the more the knowledge that was acquired the better the extent of our ignorance about the universe was understood.

The universe has been established in a very complex orderly manner. The magnificent order observed cannot be expressed well in words, but may also be expressed using mathematics. A person who develops their knowledge of mathematics can understand more about this supreme order. For example, the universal gravitational law, which describes the movement of planets, can best be understood through mathematical equations, while the solutions of the equations yield the well-known elliptic paths. The concept of infinity that is attributed to the Creator can be realized through the concept of infinity that is frequently used in mathematics. So mathematics is an essential tool in developing our understanding of the nature and universe. It is essential also in applying the principles of physical laws in nature to improve our quality of life. The design of an airplane requires extensive mathematical calculations and applications of physical laws.

Finally, it should be noted that mathematics also has its limits, as it is something that has been developed by human beings and may not be sufficient to express the total order and all physical laws. Chaotic motion, a very complex order, was developed recently to understand some phenomena that do not obey the rules of deterministic motion. A daily example of such motion would be atmospheric motion. With even super computers and satellite technology, the path of the hurricane Katrina could not be predicted precisely due to its largely chaotic behavior and these errors cost thousands of lives.

Basic engineering principles and their applications in nature

First, let’s briefly describe some of the fundamental engineering courses and their aims. Dynamics is the science of motion. It models motion, describing the relation among displacement, velocity and acceleration. The specific type of motion and its causes, such as forces, movements, impulses etc. are examined. Dynamics deal with solid bodies while fluid mechanics basically deals with liquids and gases.. In the context of fluid mechanics the rest states of fluids as well as their motions are investigated. The strength of materials deals basically with the design of structures and mechanical parts to loading conditions. Under a given loading condition, what would be the best design for withstanding the loads while using the minimum amount of material? Materials science deals basically with the mechanical properties of various materials and the causes (microstructure etc.) of those properties. Proper selection of the materials to perform the required task is another important issue.

Living organisms can also be considered as some sort of design, but of course they are different from man-made designs. Living organisms, whether they are plants, animals or human beings, are designed to perform a specific predetermined task. The organism has to move, find food, safely operate and resist the forces that act on it throughout its life, and it must reproduce. Therefore, organisms have to be designed (or more precisely created) according to the principles of engineering. The development of technology drew attention to creatures and the underlying engineering principles in their structures. Extensive research on living creatures revealed a clear conclusion: Designs applied in nature are much more sophisticated then the ones humans come up with.

Bernoulli’s principle is a fundamental principle in fluid mechanics. Basically, the principle states that when the velocity of fluid increases the pressure drops and visa versa. The lift force generated in the wing of a plane is explained with this principle. Air separates in front of the wing and reattaches at the back. When the upper surface of the wing is slightly curved and the bottom flatter, the air particles in the upper part travel a further distance at a higher velocity and meet the particles traveling under the wing at the back. The relatively higher velocity on top causes a pressure difference in the lift direction and this lift force balances the weight of the plane. Many applications of Bernoulli’s principle can be found in living organisms. A fish moving in water is a good example. In particular, fish that swim at great speeds, like the tuna, have distinctive body shapes: The mouth of the fish is at the front where the fluid comes to rest and the pressure is very high, making the fluid intake of oxygen easier. The heart is located at the minimum pressure point to make it easier for it to beat. The eyes are located on a precise saddle point, a place which is not affected by velocity changes. Since the pressure is constant for all ranges of velocities, vision is not distorted by movement. Another example is the human body. When one breathes in the fluid velocity in the nose increases and pressure drops. The outer pressure is higher than the inner pressure and the walls tend to collapse. If bones were found at the tip of the nose, they might easily break when excessive force was present. We need some other material to sustain the shape yet be elastic enough not to break down. Cartilage is the best choice in this case, as it has both strength and elasticity. Our ears are also made from the same material. If bones were used instead of cartilage in our ears, resting our head on one side would be painful or even cause damage to the ears.

Insect flight is another important issue and has attracted considerable research recently. Fluid scientists now realize that insect flight is much more developed than our flight techniques. Turbulence is the main issue. In turbulent flow, the fluids move in erratic paths colliding with each other, forming eddies and irregularities. This is a dangerous state, especially for planes, and increases the friction forces between fluid and structure. Therefore the maintenance of a regular flow (laminar flow) over the wings is advantageous. However, all insects benefit from turbulence and some portion of their lift is gained from eddies that are formed over their wings. Mechanical insect robots are built to understand insect flight. Insects have movable elastic wings, but aircraft only have immovable rigid wings. Movable elastic wings would certainly improve the flight of planes and their maneuverability, but extensive research has to be done before these designs can be safely implemented.

The bumps on the fins and heads of some whales are not accidents of nature. They were given to them by the Creator for some very special purposes. They decrease the friction (drag) force by 10% and increase the lift by 5%.1 When some have the effect of decreasing drag, they can also decrease lift and visa versa. This effect of both decreasing drag and increasing lift, which can be observed in whales, is very uncommon in fluid mechanics.

Streamlining is a very important issue for an object that moves in a fluid. Fluid particles move around an object that follows a path. Roughly speaking these paths are streamlines (in a steady motion) and it is a general rule that abrupt distortion of these streamlines should be avoided. Smooth changes in the streamline help to reduce the friction force between the object and fluid. All organisms, particularly those that move at greater speeds, have been created in accordance to streamlining principles. In these you can find many species of birds and fish, such as dolphins, sharks, whales etc. The friction reduction caused by the shape of a dolphin is still a controversial issue in science and the underlying mechanism has not yet been well understood.

An example of the strength of natural materials can now be given. Our bones are optimum structures, combining strength with lightness. In modern buildings, 60-70% of the buildings consist of the skeletons, which carry the loads and moments. In our body, our skeleton is only 1/7th of our body weight. Bones have inspired a new generation of lightweight structures. For instance, a bridge inspired by the backbone was recently designed.2 When a longitudinal cross-section is taken from a femur, some curved lines are observed. Recent numerical simulations revealed that these lines are to be found in one exact place and their configuration increases the strength of the bone. Our backbone and the muscles around it withstand very high loads, equivalent to 7,000 Newtons or approximately 700 kilograms of weight.3 The bones of mammals are hollow inside to increase strength. The inner to outer ratio of the radii is at the optimum range, between 0.4 and 0.7.4

Hardness is another important issue in some applications. Seashells are the leaders in this issue. Their microstructures are being investigated under electron microscopes to invent new materials with extreme hardness properties. Micro-cracks inside a material grow over time, finally leading to failure. This is a major problem in turbine blades and this phenomenon is responsible for some plane crashes. In seashells, micro-crack inhibiting mechanisms are inserted to prevent crack growth. Inspired by spider silk and the microstructure of bird feathers, a new generation of bullet-proof waistcoats has been developed.

Owls are very silent flyers; they need to be so in order to approach rodents as rodent ears are highly sensitive to sound. Recent investigations have shown that the special geometry of their wings results in this silent flight. Their feathers are placed to form fringes on their wings. The technology might be mimicked to reduce the noise generated in planes.5

A recent engineering discipline is robotics. There are industrial robots, which are designed to perform some very special tasks. But there are also robots inspired by living organisms. A new robot is designed to mimic caterpillar motion so that it can be stable enough in a hazardous region, pass through small gaps and detect humans who are alive under debris.6 By mimicking the motion and body of a scorpion, a military robot was designed with a camera and sensors to safely operate in a battle region.7 Of course there are human-like robots that are designed to mimic our motion and activities. The developments in robotics teach us a very important lesson: All animals are much more sophisticated in their locomotion, actions, and behavior and it is extremely hard to mimic those. A robot that can move freely like a cat and climb a tree yet maintain its balance has not yet been produced. Our robots are very slow in motion, and their stability in movement is an important technological issue that requires extensive sensors and control designs.

Newly developing engineering branches

As mentioned above, one of the newly developing branches of engineering is robotics. Day by day, better robots are being designed and those designs try to better mimic animals and humans. Some 50 years ago, a human walking might be considered a simple issue, but now we know that comfort in walking and excellent balance in such movement are very complex issues.3 Each new design in robotics adds to our knowledge of understanding animal locomotion and behavior and how miraculous their designs are. Some people think that robots may take control of the world in the future. Yet this is simply not possible: If humans are to design them, there is no way that such machines can be superior to the designers.

Other promising new fields are the MEMS (Micro-electrical machinery systems) and nano-technology. These are design attempts on extremely small scales which actually mimic some micro biological systems and micro-physics. A vertebrate consists of an enormous number of cells, while the chemical and physical events that take place inside the cells and their establishment as a system are crucial parts of staying alive. It is extremely hard to design at the micro and nano scale and it is likely that research in this field will reveal more about understanding the art of God.

Notes

1. M. Le Page, “Speed Bumps Give Humpbacks a Surprise Boost,” New Scientist, 13 January 2001, p. 22.
2. I. Sample, “A Bridge with Backbone,” New Scientist, 16 September 2000, p. 7.
3. R. Mc Neill Alexander, The Human Machine, Colombia University Press, 1992.
4. R. Mc Neill Alexander, Optima for Animals, Princeton University Press, 1996.
5. C. Seife, “Deadly Hush,” New Scientist, 6 march 1999, p. 10.
6. C. Zandonella, “Wriggle into Rubble,” New Scientist, 10 November 2001, p. 22.
7. D. Graham-Rowe, “Walk Like a Scorpion,” New Scientist, 21 April 2001, p. 18.

Nephrology is the study of the kidneys, the essential organ of excretion, and elements related to it. If due observation and research are thoroughly carried out on every part of the human metropolis, when the integrated hierarchical mechanisms are analyzed, it can be seen that numerous events are constantly taking place; these can open new doors to various sciences and offer us new horizons of reflection on the Divine Wisdom. In this way, these events are an interpretation of the saying “If all the seas were to be made up of ink, and all the trees were pens, they would still not be able to write down the knowledge of God,” which points to the existence of an Omnipotent Being with infinite knowledge.

One of these constant activities in our body is the excretion system which works like a well-regulated clock. In the body of a healthy adult, the bladder, after an accumulation of urine that has been filtered through the kidneys, resembles a balloon that has been inflated. The bladder enlarges according with the amount of urine that has been filtered by the kidneys. The autonomous nervous system has a significant role in the wonderful functioning of this urine storage mechanism. If we assume that an average adult urinates 5-6 times a day, we can say that the average time adults spend for urination is about 5 minutes daily. The autonomous system of a baby however, is not properly developed and has a very limited capacity of urine storage. Therefore, the bladder of a baby is frequently emptied. As for newborn babies, the number of times that they empty their bladder can be as much as 20-25 times a day. In this way, both the urine that comes from the kidneys flows to the bladder freely, and the urination channels are automatically cleaned.

In order to allow the urine flowing from the kidneys to the bladder to pass freely through the small tubes that measure between 3-7 mm (the urethra) the inner pressure in the bladder needs to be kept at low levels. This is realized in the body of a baby by the frequent emptying of the bladder, until the autonomous nervous system has properly developed. After the sixth month, the autonomous nervous system develops, the urine storing capacity of the bladder increases, and the number of urination times decreases. As the child grows, the ability to store urine and to excrete it at the proper time and place is completed in a gradual process. Being only one of the hundreds of wonders in the human metropolis, this balance is maintained as a clear reflection of Divine Mercy.

Cooperation in the urinary tract

There is a fascinating cooperation between the departments of this metropolis. The urine that is excreted by the kidneys does an excellent job of cleaning all along the urinary tract, like a river cleaning the stones over which it passes. This cleaning includes not only any microorganisms, but also any gravel which might form in the urination channels. Research has proved that when bacteria are injected into the bladders of healthy people no infection is developed in the urinary tract, since the pressure of their urine excretion drives the bacteria away. The protection of the kidneys by both the expansion of the flexible bladder wall and the decrease in the pressure inside the bladder is a good example of the cooperation between the kidneys and the bladder. If the pressure was not able to be decreased by such flexibility, the kidneys could not function under the resulting high pressure. The smooth functioning of the kidneys is maintained through urine excretion in suitable amounts and at a suitable pressure. Taking all this for granted, one usually comes to realize what a blessing the excretion system is only when there is a problem.

The urination of a baby in the womb

The placenta has the duty of being the main regulator of the feeding and excretion systems of a fetus. The kidneys of a fetus also play significant roles. For instance, they balance acidity through liquid electrolytes, carry out the functions of hormone production, and growth. From the fourth month on, the fetus begins to produce urine and the bladder is filled and emptied every 30-60 minutes. The urine inside the bladder is emptied into the amniotic fluid which surrounds the fetus like a protective pad. The duty of the amniotic fluid includes protecting the fetus against the changes in the mother’s body temperature, providing space for normal development, providing suitable conditions for food and oxygen supply, and protecting the baby against any possible blows that the mother’s belly might be exposed to. The amniotic fluid in which a baby is placed is a liquid similar to urine, and it is produced for the comfort of this new guest to our world.

The formation of urine

The blood, which is charged with transmitting nutrients and oxygen even to the remotest parts of the body, brings the toxic disposal our body has produced due to various causes on its way back to the kidneys. The blood, which bears the responsibility of maintaining the health of metropolis of the body, is continuously filtered when it reaches the kidneys. In the kidneys, the waste material is so delicately separated that it as if the kidneys know “which substance is needed in what amounts,” without meticulous calculation and infinite knowledge. Artificial kidneys supported by latest technology (like modern devices of dialysis) are never a substitute for a real kidney. A healthy kidney, which is made to serve under the veil of causes created by the Owner of infinite knowledge and power, does its duty with divine guidance. It sends what is to be disposed of to the bladder in the form of urine.

The substances urine contains are used when diagnosing illnesses, for they possess different qualities. The color, smell, and density of the urine and the substances it contains give us various clues about the health of that person. Deviations in the sensitive balance established in the excretion system are considered to be a sign of something gone wrong in the human metropolis. In other words, a urine analysis is an important indication of health, for many factors, such as our lifestyle, our eating habits, disease, and the medicines we use can effect changes on the consistency and composition of the urine (figure 1-3). The urine of a healthy person is yellow and clear. This color is derived from the urochrome pigment along with urobilin and uroerythrin. Colorless urine can be seen if there has been recent fluid consumption, or the use of diuretics, or disorders such as different types of diabetes (diabetes mellitus, diabetes insipitus, etc). The color of urine can fluctuate between yellow and clear within the day (for example, 1-2 hours after a meal it can be clear, whereas it can turn to dark orange due when one has been making heavy effort). Beetroot, artificial colorings and some drugs can turn the urine red. When the complaints of a patient are taken together with a medical examination and lab analyses, urine samples which are colored red-brown, blue-grey, milky-white or which are cloudy may all be symptoms of disease.

As we learn new things about urine we will hopefully attain a deeper comprehension of the infinite divine blessings that have been bestowed upon us, offering thanks to our Creator from new perspectives. 

Like everybody else, you were settled in a safe, well-guarded place. The door of that place was closed immediately after you were admitted therein as a treasured guest. You began to develop in a certain direction. No one knew for certain that you would be able to come into the world, that you would develop into a male or female or exactly when and where you would be born, nor what you would be like, how long you would live, where or how you would spend your life, when and where you would die, and so on.

After you underwent certain stages of development, you entered into the world as a unique, living individual. Until then you had resembled every other embryo in the wombs of mothers. But once life was breathed into you, you entered a completely new, different stage of development. The food with which you were fed or the particles which entered your body from earth, air and water were in no way different from those which had been entering your body before, and which enter all other living bodies. But for all that sameness, out of all that sameness, you came into your individuality-distinguished in personality capabilities, ambitions, bodily characteristics down to your fingerprints and the lines on the palms of your hands.

The potential alternatives before you were only you were countless: whether you would be white or black or of some other complexion; what colour your eyes would be, what kind of hair you would have, and so on. And neither you nor your parents had any part in determining your sex, colour, date and place of your birth, and your nationality Also, no one and nothing had any part in arranging the immediate or general environment around you. Like everybody else, you found yourself in an environment suitable for sustaining your life: your physical belonging with the world had been arranged long before you or anyone else came into it.

Should you then not reflect on all these phenomena? Is it conceivable that you are quite unable to discern an absolute knowledge, an absolute will and an absolute power behind these phenomena? Is it possible for any power except one who knows all human beings in all the detail of the physical, biological, psychological and spiritual structures of each, who knows the whole of nature with all its parts from the minutest to the largest, to have brought you and your environment into existence? Is it conceivable that any being who lacks in an absolute will-power to determine every creature in all its aspects, every human being with all his or her characteristics, could have fashioned you and your environment? Does it befit one who has been granted some power of reasoning to attribute all these phenomena to other than one who disposes absolute power?

The Qur’anic descriptions and those in the Hadith are remarkable for their accuracy in relation to what is known about the subject now. But, what was known then? Until 1688, among Muslim as well as European scientists, the Aristotelian account dominated, no one daring to question it. The two theories in Aristotle’s time were: (a) the embryo is preformed as a miniature in either the male semen or the female secretion and then grows in the womb; and (b) the embryo is actually formed and created out of the menstrual blood. Aristotle favoured the second view, adding that male semen caused the menstrual blood to coagulate, like milk curdling into cheese. The Qur’anic description tells us, by contrast, that (a) the embryo is not pre-formed but grows in successive stages (71.13-14, 23.12-14,22.5); and (b) is formed equally of male and female fluids (76.2). The relevant ahadith re-state what is in the Qur’an. Interestingly, while exegetes of Qur’an and Hadith did not fall into error in their account, many Muslim scientists and doctors, under the spell of Aristotle, repeated Aristotle’s (incorrect) view. Thus, about 700 years after the Revelation, Ibn Hajar al-Asqalani commented: ‘Many of the anatomists claim that the semen of the male has no role in creation of the baby. Its role, they claim, is limited to curdling the menstrual blood… The saying of the Prophet denies what they say. The semen of the male actually participates equally to that of the female in formation of the embryo.’

The pre-formation theory lasted in Europe into the 18th century when it was believed that a full miniature existed either in the female ovum or in the male sperm, then simply got bigger in the womb. This theory was destroyed gradually and was no longer held in any form after 1900. Von Baer (1829-37), called the ‘father of embryology’, identified the human ovum. Subdivision of the egg, i.e. growth of the embryo in successive stages, was properly demonstrated and understood in 1839 by Schwann and Schleiden. And in 1875, Hertwig described the fertilization of an egg by a sperm. Then in 1883, Von Benden showed that male and female cells contribute the same number of chromosomes to the embryo.

However, not until this century, have a number of discoveries established how and when the sex of the embryo is determined; how and when the hones and musculature, the organs of sight and hearing, the nervous system, and so on, develop. It is rather more than remarkable, therefore, that in Qur’an and Hadith we should find unmistakably accurate and detailed references to these matters.

The earliest of the successive stages of embryo development is the nutfah, in turn distinguished as male and female nutfah (in modern terminology, gamete), the two being commingled to form the nutfat amshaj (zygote). The Qur’an clearly and explicitly states (75.3(t), 53.45-6, 59. 58-9) that the sex of the embryo is carried in the fluid ejaculated by the male (X or Y chromosome in the fertilizing sperm). Also, in the Qur’an s emphasis that growth is from a lucre drop of fluid, we find a clear pointer to the fact that the spermatozoa make up a mere 0.5% of the ejaculated fluid, in which tiny quantity are carried an average 2 to 300 million individual sperms.

The nutfat amshaj (zygote) develops into ‘alaqah (that which clings) which attaches itself to the uterine wall. The stunning precision of the term ‘alaqah for the detail of how the zygote attaches, implants and is nourished in the womb, is striking in Dr Albar’s account. (For even more on the detail, see Sikander Hussain ‘Al’Alaq: the mystery explored’, Ark Journal, London, 1986, pp. 31-6.) The ‘alaqah is transformed into mudghah (chewed lump), the somite(s) from which hones and muscles are subsequently differentiated. The mudghah stage includes also the pharyngeal arches (out of which face, ear and neck are formed) – the marked indentations give the embryo the look of a ‘chewed lump’. The Qur`an’s allusion (22.5) to mukhlaqa and ghairu mukhlaqa, formed and non- formed development of the mudghah, is now readily understood as the critical period of organogenesis, when the embryo is most susceptible to factors which can cause congenital malformations. The Qur’an says (2.259): kayfa nanshuzu-ha thumma naksu-ha tahma, ‘how We erect them (the bones) then enclothe them in flesh’. Nanshuzu-ha, here inadequately rendered ‘We erect them’ is as informative as any modern textbook description, for example ‘With time a number of needle-like spicules are formed which progressively radiate from the primary ossification centres towards the periphery.’

The pre-formational aspects of embryo development are now understood as hereditary characteristics contributed by parental genes. In the Qur’an (81). 17-19), the nutfah (male and female gametes) is said to carry these predetermined characteristics. There are several ahadith confirming this reading. One, in the Sahih of Muslim, explicitly mentions 4O -42 days after fertilization as the moment when the angel enters the womb and ‘gives the nutfah its shape and form, creates its hearing and visual apparatus, builds up the hones, the muscles and forms the skin. He then asks, 0 God, is it a boy or a girl, what is its livelihood and what will be its lifespan? God gives His answer and the angel writes all that will come. ‘The textbooks tell us that ‘In the sixth week of development the Primordial germ cells invade the genital ridges; if they fail to reach the ridges, the gonads do not develop..’ The site of formation of the gonads is indicated in Qur’an 86.5-9 as ‘between the backbone and the ribs’. This is exactly right. Once formed the gonads differentiate into either male and female and make their progress in the body accordingly. Blood and nerve supply and lymph drainage remain connected, even in the adult, to the area ‘between the backbone and the ribs’.

In this review only a few of the great many correspondences between the Quranic text or ahadith and current knowledge about human embryo development have been mentioned. What is the point of noting these? Almost all of these Qur’anic verses have as their general context a reminder of the resurrection. The re-creation of individual human life after death. We are confronted with the fact of life as a stunning miracle of the Mercy and Omnipotence of the Creator. Knowledge of the successive stages of growth from the near-nothing of a spot of bodily fluid cannot but create a sense of awe at the responsibility one carries for the miracle of one’s life. And one carries it hack to Him whose care initiated, ordained, proportioned and sustained our life – the contrasted human contribution being that drop of ‘lowly fluid’. Then, what – except perversity – could allow us to doubt that the Creator has concern for how we use our lives, or doubt that He can and will bring us again to life so that we may ourselves understand fully the worth of our intentions and actions? Also, these verses, urging a meditation upon the fact of life rather than upon the fact of death, educate a positive temperament, a positive attitude. Religious responsibility can be awakened by reflecting upon the wonder of birth, as much as by reflecting upon the mystery of death.

No textbook about human embryo development can inspire reflections of this kind. Of course, it is also of the utmost importance to know that the information in the Qur’an, given in words which are extraordinarily precise and yet remain generally intelligible, is accurate. Most non-Muslims do not believe that the Qur’an is the Book of God verbatim, as Muslims believe. In trying to make sense of the phenomenon – so copiously illustrated by Dr Albar from the field of human embryology – of how so much accurate knowledge is there in the Book, they may be led to question the assurance with which they hold to their non-belief.