Micro-Filters: Kidneys

How Is the Blood Purification Carried Out?

Blood flowing through the body is first subjected to filtering in the kidneys. In them, a large number of minute filters enable this purification to take place. A manifest miracle can be seen when one considers these filters’ number: In a single kidney there are 1,200,000 filters known as nephrons. These micro-filters consist of a Bowman capsule—a hemispherical structure composed of capillary vessels at the end of the nephron, the glomerulus, the Malpighian corpuscle, and kidney veins. 43 Each of these 1,200,000 filters possesses a perfect creation with thousands of microscopic holes.

Approximately one-quarter of the blood leaving the heart comes direct to the kidneys, by means of the renal arteries, which accounts for more than 1 liter (0.3 gallons) a minute. The vein carrying the blood divides into thinner ones as soon as it enters the kidney. Each of these thin vessels leads to a micro filter. Thanks to the pressure established by the heart, the blood strikes the surface of the filter at considerable speed, and toxic products and water pass through to the other side of the filter. Since proteins and blood cells are too large to pass through the filter, they remain behind. The blood that is unable to pass is thus cleansed and purified.

Consider the information provided so far: Some 1,200,000 filters have been located in a piece of flesh the size of one’s fist. The same detailed creation exists flawlessly in every single filter. In every nephron, for instance, there is a section called the glomerulus—a ball of blood vessels inside the Bowman capsule. Later, these blood vessels join up and leave the capsule as an artery. Let us now have a brief look at this region.

The glomerulus that enters the Bowman capsule divides into a number of capillary vessels that will constitute the vein node. These blood vessels will later join up and leave the capsule as an artery.

A blood vessel network between two arteries can only be seen in this part of the body. Since the glomerulus capillaries lie between two arteries, the blood pressure is higher here than in the body’s other capillary vessels. The higher blood pressure maintained in this region serves a very specific purpose: to make the filtering process more effective. Again in contrast to other capillary vessels, the walls of the vessels here are double-layered—a structure that not only allows them to withstand this higher blood pressure, but also prevents proteins and leucocytes from leaking out of the blood vessels.

Thanks to all these features, only water and substances dissolved in water pass from the glomerulus capillary vessels into the Bowman capsule. Although there is reverse absorption in other capillary vessels, none occurs in these.

These veins can be cited as an example of the kidneys’ overall creation. The veins that bring the polluted blood to the filters, removed the filtered waste products and carry the remaining clean blood back to the body are equipped with 1,200,000 filters, created in such a way as to create no confusion whatsoever. The veins all lead where they need to go. The path that blood vessels follow in the kidneys, where they will go to carry these products, and where they will leave the kidneys—all is the product of a special creation.

What has been described so far are very small parts of the kidneys’ detailed structure. Many books have been written, countless studies and experiments carried out, regarding just a single process in the kidneys or a substance that’s secreted. All the research into human anatomy leads to a single conclusion: that all of our body’s components have to exist as a whole, because our very survival depends on our bodies functioning as a single unit. If the venous system just described did not exist in the kidneys, the body’s excretory system and equilibrium would be impaired, resulting in death.

This totally undermines the claims of evolutionists, who maintain that the human body assumed its present form under the gradual effects of such factors as chance and mutations. But to follow their chance-based scenario: Is it possible for a capillary vessel to form by chance, and then to combine with other capillaries, again by chance, to form capsules in the kidney, which also emerged by coincidence, then for these to combine in the form of an artery, and then to acquire the most appropriate structure for the performance of the filtering process—all by chance? It is obvious that any such an account, based on one coincidence after another, is nothing more than a fairy tale. Not one such system could possibly form in such a way in a living thing. Everything in the human body exists as a result of perfect planning. There is, of course, a Power that fulfils this creation, which power belongs to the Omniscient Allah.

Moreover, what has been described so far is only the bare outline of the processes that take place within the kidneys.

THE KIDNEYS, CAPABLE OF DISTINGUISHING GLUCOSE, 
PROTEIN AND SODIUM ARE A MANIFEST PROOF OF CREATION

Your two kidneys cleanse the blood coursing through your body throughout your life. Part of the substances filtered is sent back to the body, and the remainder expelled as serving no purpose. But how can the kidneys distinguish between protein, urea, sodium, glucose and other substances? 

The fore-mentioned node-like body consisting of blood vessels in the kidneys, known as the glomerulus, filters the substances in the blood. In contrast to the body’s other blood vessels,  these vessels are covered in three different layers. These three layers decide, with the greatest care, which substances are to be filtered out and expelled, and which are to be returned to the body. But what does a cell membrane measure—and by what mechanism does it identify all the substances in the fluid reaching it and decide which region they should go to? Blood reaching the kidneys contains a great mixture of substances, including glucose, bicarbonate, sodium, chloride, urea and keratin. As the kidney expels all, or part of these substances, it also sends all or another part back to the body. How can a piece of tissue decide which and how much of these substances to expel? The answer lies in the fact that it has been flawlessly created.

The glomerulus’ selectivity depends on the sizes and electrical charges of the substances in the fluid. This means that the glomerulus possesses the ability to identify the molecular weights of the sodium and glucose mixed up in the blood—and the proteins that have negative electrical charges. In this way proteins, of vital importance to the body, are not expelled but are reabsorbed into the body.

How can the glomerulus, made up of blood vessels, possess such superior ability, despite having received no training in chemistry, physics or biology? Yet glomerules perform their functions to the letter because they are inspired to do so by Allah, their Creator. None of the substances they filter is selected at random, or else it would be impossible for our bodies to survive in a healthy manner until these unconscious organs had located the right molecules.

Yet despite all this evidence, Darwinists are so blindly devoted to the theory of evolution that they are unable to consider these facts. For the sake of believing—and having others believe—that everything came into being by chance, they totally distance themselves from reason, logic and science.