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Urinary System Anatomy and Function The body takes what it needs from food and changes it into energy. After this, waste products are left behind in the bowel and in the blood. The urinary system keeps everything in balance by removing waste, like urea, extra salt, extra water and other things the body does not need.. Kidneys There are a pair of kidneys that are purplish-brown and are located below the ribs in the middle of the back. Two Ureters Each kidney has a narrow tube called a ureter, which carries urine from the kidney to the bladder. Bladder The bladder is a triangle-shaped, hollow organ located in the lower abdomen. Two Sphincter Muscles Circular muscles that help keep urine from leaking by closing tightly like a rubber band around the opening of the bladder. Urethra The tube that allows urine to pass outside the body. The brain signals the bladder muscles to tighten, which squeezes urine out of the bladder.