<P> Stages 1 ( Isovolumic relaxation ) and 2 ( Inflow : `` Rapid inflow '' , `` Diastasis '' , and `` Atrial systole '' ) together complete the ventricular `` Diastole '' period , during which blood returning to the heart flows through the atria into the ventricles . Near the end of the `` Diastole '' , both atria pump blood into the ventricles during atrial systole , aka atrial kick . Stages 3 and 4 are the ventricular `` Systole '' period , which is the simultaneous pumping of separate blood supplies from the two ventricles -- one to the pulmonary artery and one to the aorta . </P>
<P> Stages 1 ( Isovolumic relaxation ) and 2 ( Inflow : `` Rapid inflow '' , `` Diastasis '' , and `` Atrial systole '' ) together complete the ventricular `` Diastole '' period , during which blood returning to the heart flows through the atria into the ventricles . Near the end of the `` Diastole '' , both atria pump blood into the ventricles during atrial systole , aka atrial kick . Stages 3 and 4 are the ventricular `` Systole '' period , which is the simultaneous pumping of separate blood supplies from the two ventricles -- one to the pulmonary artery and one to the aorta . </P>
the cardiac event that completes ventricular filling is referred to as
the cardiac event that completes ventricular filling is referred to as
`` Diastole ''
`` Diastole ''