Muscles that guard entrances and exits of internal passageways are_____ muscles.
A) convergent
B) bipennate
C) pennate
D) circular
E) parallel

Name: Muscles that guard entrances and exits of internal passageways are_____ muscles. A) convergent B) bipennate C) pennate D) circular E) parallel
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Question

Quizplus · Accepted Answer

Circular muscles, also known as sphincters, are responsible for guarding entrances and exits of internal passageways by contracting and relaxing to open or close these passageways.

Muscles That Guard Entrances and Exits of Internal Passageways Are_____