Which phase follows ventricular systole?

Ventricular systole is the phase of the cardiac cycle where the ventricles contract, pumping blood into the aorta and pulmonary artery. Following this contraction, the ventricles need to undergo relaxation to refill with blood. This process is known as ventricular diastole. During ventricular diastole, the ventricles relax, pressure decreases, and blood flows from the atria into the ventricles, filling them with blood in preparation for the next contraction.

Atrial contraction refers to the phase where the atria contract to push blood into the ventricles, which occurs just before ventricular systole. Isovolumetric contraction happens during the latter part of ventricular diastole, when the ventricles begin to contract but the valves remain closed, meaning no blood is ejected yet. Atrial diastole is the phase in which the atria relax and fill with blood, which occurs concurrently with ventricular systole rather than after it. Thus, the logical progression from ventricular systole is to ventricular diastole, allowing for proper cardiac function and circulation.