The human body has two kidneys. Each kidney is composed of about 1million nephrons. The nephrons are units, which are mainly composed of blood vessels. It is through these vessels that toxin excretion and filtration occurs and water is let out.

The kidneys play key roles in body function, not only by filtering the blood and getting rid of waste products, but also by balancing levels of electrolytes in the body, controlling blood pressure, and stimulating the production of red blood cells. The kidneys also help in creation of vitamin D (essential for the bones).

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