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Biology, 25.06.2019 04:00 brenton14

The first heart sound is made a) blood moving to the atria b) blood moving to the ventricles c) opening of the valve between the atria and the ventricles d) closing of the valve between the atria and the ventricles

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The first heart sound is made a) blood moving to the atria b) blood moving to the ventricles c) ope...
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