Which phase occurs after blood is ejected from the ventricles?

The phase that occurs after blood is ejected from the ventricles is isovolumetric relaxation. During this phase, the ventricles begin to relax after the contraction and ejection of blood into the aorta and pulmonary trunk. At this moment, both the atrioventricular (AV) and semilunar valves are closed, and the volume of blood in the ventricles remains constant, hence the term "isovolumetric."

This phase is crucial as it allows the pressure within the ventricles to drop significantly, preparing them for the next filling phase. It is essential for ensuring that the ventricles can refill with blood during the subsequent diastolic phase. Understanding this phase is key to grasping the overall cardiac cycle and how the heart manages blood flow effectively.