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COMLEX Osteopathic Medicine

Category - Digestion

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The internal anal sphincter is characterized by _______________________.

Smooth muscle that encircles the top end of the anal canal
Skeletal muscle that encircles the top end of the anal canal
Smooth muscle that encircles the lower end of the anal canal
Skeletal muscle that encircles the lower end of the anal canal

Explanation

Answer - A - The internal anal sphincter is characterized by smooth muscle that encircles the top end of the anal canal. The external anal sphincter is characterized by skeletal muscle that encircles the lower end of the anal canal.

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COMLEX Osteopathic Medicine

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COMLEX Osteopathic Medicine

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