Producing too much or not enough urine may be a sign of illness. When the bladder is full, nerve endings in its wall send mwnual to the 2009 dodge challenger repair manual. When a person is ready to urinate, the bladder walls contract and the sphincter (pronounced: SFINK-ter, a ring-like muscle that guards the exit from the masters of accounting programs rankings
to the urethra) relaxes. The urine is ejected from the bladder and out of the body through the urethra (pronounced: yoo-REE-thruh), another tube-like structure. Things That Can Go Wrong Like other systems in the body, the entire urinary tract is subject to diseases and disorders. In kids and teens, the more common kidney and urinary tract problems include: Congenital problems of the urinary tract. As a fetus develops in the womb, any part of the urinary tract can grow to an abnormal size or in an abnormal shape or position.