what controls the release of urine from the bladder
Good bladder control means you only urinate when. you want to. Most of the bladder control system lies inside the. pelvis. Muscles in the floor of the pelvis need to be. strong and tight to hold up the bladder, a muscular, balloon-shaped sac that stores urine and eliminates. it from the body. Urine exits the bladder and. body through a tube called the urethra. Muscles. surrounding the urethra, called sphincter muscles, squeeze tight to keep it closed. Some of these. muscles are voluntary muscles and are under your. control.