what other organ systems are the kidneys associated with
Kidney and urinary system parts and their functions: 1  Two kidneys. This pair of purplish-brown organs is located below the ribs toward the middle of the back. 2  Two ureters. These narrow tubes carry urine from the kidneys to the bladder. 3  Bladder. This triangle-shaped, hollow organ is located in the lower abdomen.  Two sphincter muscles.