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The anus can be affected by the internal and external sphincters, which are muscles that use tonic contracture to keep certain parts of the gastrointestinal tract closed, until it is time for something to pass. The internal sphincter is involuntary and what gives you the urge to defecate (have a bowel movement). The external sphincter is voluntary. This is what allows you to hold your feces - which was learned during potty training - until it is convenient to have a bowel movement. If the external sphincter continues to suppress the internal sphincter, it is possible that this could contribute to constipation.

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16y ago

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