Which Event Occurs First During Diastole?

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Which Event Occurs First During Diastole?

Which event occurs first during diastole? A The atria contract while blood flows into the relaxed ventricles. B The atria and ventricles are relaxed, and blood flows into the atria. C The atria and ventricles contract simultaneously. D Blood flows into the relaxed atria while the ventricles contract.
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B; Diastole is the relaxation phase of the cardiac cycle during which the chambers of the heart are relaxed and blood can enter them passively.

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