Two sphincter muscles regulate urination: the internal urethral sphincter,which is voluntary,and the external urethral sphincter,which is involuntary.

Name: Two sphincter muscles regulate urination: the internal urethral sphincter,which is voluntary,and the external urethral sphincter,which is involuntary.
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Quizplus · Accepted Answer

The internal urethral sphincter is involuntary, controlled by the autonomic nervous system, while the external urethral sphincter is voluntary, controlled by skeletal muscle.

Two Sphincter Muscles Regulate Urination: the Internal Urethral Sphincter,which Is