The internal urinary sphincter is:
A)made of striated muscle
B)contracted most of the time
C)both A and B
D)both A and B, and it is involuntary

Question

Quizplus · Accepted Answer

The internal urinary sphincter is made of smooth muscle, not striated muscle. It is also contracted most of the time, which helps to prevent urine leakage. However, it is an involuntary muscle, meaning we have no conscious control over its contraction or relaxation.

The Internal Urinary Sphincter Is