Which statement is NOT true of the urinary bladder?
A)The detrusor muscle is smooth muscle that contracts to empty the bladder.
B)The trigone is on the floor of the bladder and does not expand.
C)The rugae of the mucosa permit expansion of the lining.
D)The internal urethral sphincter is smooth muscle that contracts to permit urination.

Question

Quizplus · Accepted Answer

The internal urethral sphincter is not responsible for permitting urination; it is actually responsible for preventing urine from leaking out of the bladder until it is time to urinate. The external urethral sphincter, which is made of skeletal muscle, is the one that contracts voluntarily to permit urination.

Which Statement Is NOT True of the Urinary Bladder