Kidneys are bean-shaped organs, each about the size of a fist. They are located near the middle of the back, just below the rib cage. These pictures show how a kidney works and what's inside a kidney. Blood enters the kidney through the renal artery and after its filtered by the kidney the clean blood leaves through the renal vein. Kidneys are pretty amazing filters. Inside the kidney, the filtering is done by tiny things called nephrons. There are about a million nephrons in each kidney. Each kidney can filter about 200 quarts of blood to remove about 2 quarts of waste and extra water every day. The waste and extra water become urine, which flows down to the bladder through tubes called ureters. The bladder stores the urine until it's excreted in the bathroom.
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