The voluntarily controlled sphincter fashioned by skeletal muscle at the point where the urethra passes through the pelvic floor is called the ________.
A) internal urethral sphincter
B) internal anal sphincter
C) external urethral sphincter
D) trigone
E) detrusor sphincter

Question

Quizplus · Accepted Answer

The voluntary sphincter controlled by skeletal muscle at the point where the urethra passes through the pelvic floor is the external urethral sphincter. The internal urethral sphincter is involuntary and made of smooth muscle. The internal anal sphincter is an involuntary sphincter made of smooth muscle located in the anal canal. The trigone is a triangular area in the bladder where the ureters enter and the urethra exits. The detrusor muscle is the smooth muscle of the bladder wall.

The Voluntarily Controlled Sphincter Fashioned by Skeletal Muscle at the Point