Your urinary tract aids in eliminating liquid waste from your body. Urine is produced as a result of the kidneys’ ongoing filtering of blood to remove unnecessary chemicals and water. The bladder receives urine through the ureters. Urine accumulates in the bladder and is held there until you’re ready to let it out. When to release the muscles that surround the bladder’s entrance, the brain sends signals to the sphincter. The tube that takes urine from the bladder outside of the body is called the urethra. The prostate gland in men surrounds the urethra close to the bladder.