How many sphincters in urinary system?

Answer 1

There are two. "The internal sphincter controls the bladder's opening into the urethra, and the external sphincter (the pelvic muscles) controls the opening of the urethra below the prostate. In women, there is little definition between the internal and external sphincters."

-Rosdahl, Caroline, & Kowalski, Mary. (2008). Textbook of basic nursing. 530 Walnut Street, Philadelphia PA 1910: Lippincott Williams & Wilkins.

Answer 2

40 including the eye, mouth, esophagus, urethra, stomach, upper intestiens, lower intestines, anus etc.

Answer 3

one, that closes the anus

^ There are actually two sphincters that work to close the anus. one is smooth muscle which sends the message to your brain that you need to go

Answer 4

1... unless you have more than 1 urethra