The atrioventricular valves permit blood flow

A) in one direction only.
B) in both directions.
C) in many directions.
D) in opposite directions on the right and left.
E) from a ventricle to an atrium.


A

Anatomy & Physiology

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The process by which a single cell duplicates itself is known as ____

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This muscle allows you to stand on your tiptoes.

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