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In which phase of the heartbeat, the heart relaxes and allows the chambers to fill with blood?
Diastole is the part of the cardiac cycle during which the heart refills with blood after the emptying done during systole (contraction). Ventricular diastole is the period during which the two ventricles are relaxing from the contortions/wringing of contraction, then dilating and filling; atrial diastole is the period during which the two atria likewise are relaxing under suction, dilating, and filling. The term diastole originates from the Greek word διαστολή, meaning dilation. Evidence thus provided shows Diastole is not a passive phase.
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