You have two kidneys, each the size of a fist, located at the lower back end of your ribcage. Each kidney contains up to a million units called nephrons (nfrns). The kidneys consist of two major compartments: the blood compartment, which is basically a very small blood vessel, and the urine compartment, which consists of tubules (tbyls). In the tubules, chemicals and water are removed based on the body’s needs. The urine from the tubules eventually drains into the middle of the kidney. From here, each kidney drains the urine into the bladder, where it sits until it is excreted from your body.