Which muscle is under voluntary control?
A) External urethral sphincter
B) Internal urethral sphincter
C) Detrusor muscle
D) None of these are correct.

Question

Quizplus · Accepted Answer

Three layers of smooth muscle make up the detrusor muscle of the bladder's walls. This muscle is very important in the physiology of passing urine. At the base of the bladder, the detrusor muscle thickens to form the internal urethral sphincter. This muscle compresses the tube leading from the bladder (the urethra) so urine remains in the bladder. The urethra passes through the pelvic floor where it is encircled by a skeletal muscle called the (external urethral sphincter). Since it is skeletal muscle, the external urinary sphincter is under voluntary control.

Which Muscle Is Under Voluntary Control