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The ventricular ejection phase is after the isovolumetric contraction phase. The ventricular ejection phase of the cardiac cycle is when the pressure in the ventricle becomes higher than the pressure in the aorta or pulmonary trunk (depending on which ventricle we are looking at). The high pressure in the ventricle will cause blood to be ejected from the ventricle into the aorta or pulmonary trunk. This is because blood moves from higher to lower pressure. Another way to consider the high pressure concept, is to picture the blood having a high kinetic energy (bouncing on the walls of the ventricle) and the blood molecules want to decrease their kinetic energy by moving to a less crowded area (such as the aorta or pulmonary trunk). Also, after the ventricular ejection phase, the blood will attempt to move back into the ventricle from the aorta or pulmonary trunk. This is inhibited by a semilunar valve closing (which is the dub sound in the common heartbeat sound, lub dub).

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