What structure is formed by the thickening of the smooth muscle cell wall surrounding the bladder that regulates the flow of urine from the bladder?
A) bladder sphincter
B) urethral muscle
C) internal urethral sphincter
D) detrusor muscle
E) external urethral sphincter

Question

Quizplus · Accepted Answer

The internal urethral sphincter, formed by the thickening of the smooth muscle at the bladder neck, regulates the flow of urine from the bladder into the urethra.

What Structure Is Formed by the Thickening of the Smooth