Which of the following is smooth muscle?
A) internal urethral sphincter only
B) external urethral sphincter only
C) detrusor muscle only
D) both the internal urethral sphincter and detrusor muscle
E) both internal and external urethral sphincters

Question

Quizplus · Accepted Answer

The internal urethral sphincter and the detrusor muscle are composed of smooth muscle. The internal urethral sphincter is responsible for involuntary control of urination, and the detrusor muscle is the main muscle of the urinary bladder. The external urethral sphincter, in contrast, is composed of skeletal muscle and is under voluntary control.

Which of the Following Is Smooth Muscle