What is Urethral sphincters?
In [[mammal]]s, the '''Urethral sphincters''' are two [[muscle]]s that control the exit of [[urine]] from the [[bladder]] through the [[urethra]]. If either of them contracts, the urethra is sealed shut. In [[male]] mammals, one of the muscles is placed around the urethra. In [[female]] mammals, it is placed on the side of the [[vagina]]. In male mammals, the muscles are also used to transport the [[sperm]], when an [[erection]] happens. {{biology-stub}} [[Category:Anatomy of the urinary system]]