drewjhan2015
drewjhan2015
14-10-2016
Health
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what is the function of a closed heart valve
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georgiamontes55
georgiamontes55
14-10-2016
As the heart contracts and relaxes, the valves opens and shuts, letting the blood flow into the ventricles and atria at alternate times.
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angelicaand0404
angelicaand0404
23-10-2018
Gradpoint// They prevent blood from flowing backwards
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