the cardiac event that completes ventricular filling is referred to as
Cardiac cycle 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 ventriclesâ€”one to the pulmonary artery and one to the aorta.