A muscle that decreases the size of an opening is a
A)rotator.
B)tensor.
C)pronator.
D)sphincter.
E)depressor.

Name: A muscle that decreases the size of an opening is a A)rotator. B)tensor. C)pronator. D)sphincter. E)depressor.
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Question

Quizplus · Accepted Answer

A sphincter muscle decreases the size of an opening by contracting and closing the opening. Examples of sphincter muscles include the anal sphincter, urinary sphincter, and esophageal sphincter.

A Muscle That Decreases the Size of an Opening Is