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Kidneys are bean-shaped organs, each about the size of a fist. The kidneys are located near the middle of the back just below the rib cage and are sophisticated reprocessing machines. Each day, an person's kidneys process about 200 quarts of blood to sift out about 2 quarts of waste products and excess water. These wastes and water become urine which then exits the body through urination. Wastes that are present in our bloodstream, come from the normal breakdown of active tissues, such as muscles and from food sources. The body needs food for...