![]() Kidney cells also convert vitamin D to its active form. By producing the enzyme renin, they help regulate blood pressure, and their hormone erythropoietin stimulates red blood cell production in the bone marrow. ![]() The kidneys also regulate the blood’s volume and chemical makeup so that the proper balance between water and salts and between acids and bases is maintained. Although the lungs and the skin also play roles in excretion, the kidneys bear the major responsibility for eliminating nitrogenous wastes, toxins, and drugs from the body. The kidneys then process this filtrate, allowing wastes and excess ions to leave the body in urine while returning needed substances to the blood in just the right proportions. Every day, the kidneys filter gallons of fluid from the bloodstream. The function of the kidneys are as follows: Practice Quiz: Urinary System Anatomy and Physiology.
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