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The rectum is a portion of the end of the colon just before the anus and is controlled by involuntary muscles (smooth muscle). I believe the anal spincter or rear end opening has 2 types of muscles. The internal anal sphincter is involuntary fortunately and keeps us from social embarrassment. The external anal sphincter is voluntary and allows us to properly time the release of gas at the right moment in a conversation.

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16y ago
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13y ago

Yes. Its the one that makes a 6 pack if you do sit ups. Its allso used to create extra pressure in the trunk of the body to assist exhalation or excretion

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10y ago

This muscle is a voluntary muscle just as all skeletal muscles are.

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Q: Is rectum a voluntary muscle or involuntary muscle?
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