The internal urethral sphincter is composed of which arrangement and type of muscle fibers?
1) circular
2) longitudinal
3) oblique
4) smooth
5) skeletal
A) 1 and 4
B) 2 and 4
C) 2 and 5
D) 1, 2, and 5
E) 1, 3 and 5

Question

The internal urethral sphincter is composed of which arrangement and type of muscle fibers? 
1) circular
2) longitudinal
3) oblique
4) smooth
5) skeletal
A) 1 and 4
B) 2 and 4
C) 2 and 5
D) 1, 2, and 5
E) 1, 3 and 5

Quizplus · Accepted Answer

The internal urethral sphincter is composed of circular smooth muscle fibers. This sphincter is involuntary and controlled by the autonomic nervous system.

The Internal Urethral Sphincter Is Composed of Which Arrangement and Type