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1 April, 19:36

A word in a muscle name that indicates that the muscle decreases the size of an opening is

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  1. 1 April, 21:31
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    "sphincter"

    A sphincter is a circular muscle that maintains contraction unless, otherwise, required to relax as a physiological response. Examples of sphincters can be: the precapillary sphincters, the sphincter ani, the esophageal sphincter or the i ris sphincter. They are to control the entrance of liquids or solids, gases or even light.
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