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Mrac [35]
3 years ago
5

What is the function of a closed heart valve

Health
2 answers:
almond37 [142]3 years ago
7 0
As the heart contracts and relaxes, the valves opens and shuts, letting the blood flow into the ventricles and atria at alternate times.
NISA [10]3 years ago
6 0

Gradpoint// They prevent blood from flowing backwards

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