| sphincter muscle |
sphincter: a ring of muscle that contracts to close an opening
출처: wordnet.princeton.edu/perl/webwn
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| sphincter muscle |
A circular muscle that opens or closes like a drawstring. In the normal state, sphincter muscle contracts and is closed. When the muscle relaxes, it opens.
출처: www.hemorrhoidsinplainenglish.com/hemorrhoid/gloss...
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