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vladimir1956 [14]
3 years ago
5

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

oper direction. A. Atria C. Arteries B. Valves D. Ventricles
Biology
2 answers:
AVprozaik [17]3 years ago
8 0
Valves, they are like flaps of muscle that keeps the blood in its place util its ready to be pumped along.

Alenkinab [10]3 years ago
6 0

Answer:

anwser is B: valves

Explanation:

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