Balas840
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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 C. Arteries B. Valves D. Ventricles



Answer :

yinkatyang
valves, they are like flaps of muscle that keeps the blood in its place util its ready to be pumped along.

Answer:

anwser is B: valves

Explanation:

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