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(anatomy) sphincter
The anal sphincter contracts to control the opening and closing of the anus.
(anatomy) iris sphincter
The iris sphincter regulates the amount of light entering the eye.
(anatomy) anal sphincter, arsehole
(anatomy) sphincter ani externus, external anal sphincter
(anatomy) sphincter ani internus, internal anal sphincter
The internal anal sphincter is a smooth muscle that controls the passage of feces in the intestine.
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