Which structure of the heart acts like an automatic door that closes once blood enters a chamber and forces it to exit in the proper direction. A. atria B. valves C. arteries D. ventricles

Which structure of the heart acts like an automatic door that closes once blood enters a chamber and forces it to exit in the proper direction.

A.
atria

B.
valves

C.
arteries

D.
ventricles

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Which structure of the heart acts like an automatic door that closes once blood enters a chamber and forces it to exit in the proper direction. A. atria B. valves C. arteries D.…

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