The part of the urinary bladder that prevents outflow of urine most of the time is the:
A)mucosa with its rugae
B)internal urethral sphincter
C)trigone
D)detrusor muscle

Question

Quizplus · Accepted Answer

The internal urethral sphincter is a smooth muscle sphincter located at the neck of the urinary bladder. It remains contracted most of the time, preventing urine from flowing out of the bladder until the appropriate time to empty it.

The Part of the Urinary Bladder That Prevents Outflow of Urine