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It is strong enough to restrict the passage of any fecal material but sensitive enough to differentiate between solid, liquid, and gas. The internal sphincter contracts during rest and sleep, and keeps small amounts of liquid and gas from escaping unexpectedly. The external anal sphincter is a thick, red voluntary muscle. There are actually two anal sphincter muscles … internal and external. When enough waste has collected, a person will feel the need to go to the bathroom. The internal anal sphincter is an involuntary smooth muscle, like the muscles of your intestines. Your version of Internet Explorer does not fully support the features of this site. There is a condition known as Anal Crohn's disease that mimics the symptoms of anal stenosis. It is the one you squeeze when you feel the urge to go to the bathroom but are not near one.

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