<P> Diastole / daɪˈæstəliː / is that 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 of contraction, then dilating and filling; atrial diastole is the period during which the two atria likewise are relaxing, dilating, and filling . The term diastole originates from the Greek word διαστολη, meaning dilation . </P> <P> For a healthy human heart the entire cardiac cycle typically runs less than one second . That is, for a typical heart rate of 75 beats per minute (bpm), the cycle requires 0.3 sec in ventricular systole (contraction)--pumping blood to all body systems from the two ventricles; and 0.5 sec in diastole (dilation), re-filling the four chambers of the heart, for a total time of 0.8 sec to complete the entire cycle . </P>

What is the relaxed state of the ventricle called