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The kidneys are bean-shaped organs about the size of a fist located near the middle of the back just below the rib cage. All the blood in the body passes through the kidneys several times a day removing waste. The waste products and any extra water the body doesn't use then become urine, which flows to your bladder where it is stored until you go to the bathroom. The waste products in the blood come from normal activity of the body and from digesting food. Your body uses the food for energy and self-repair, and after it has taken what it needs, waste products are sent to the blood. If your kidneys did not remove these waste products, they would build up and damage the body. The actual filtering of the blood occurs in tiny units inside your kidneys called nephrons. Each kidney has about 1 million nephrons. The nephron contains a glomerulus which is a tiny blood vessel that intertwines with a tiny urine-collecting tube called a tubule which removes waste and sends minerals back to the bloodstream.