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It is called systole. This is when the ventricles contract and eject blood into the lungs (from the right ventricle) or into the systemic circulation (from left ventricle).

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14y ago
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diastole

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13y ago

systole

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Q: What is the phase of ventricular contraction called?
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Continue Learning about Natural Sciences

Which phase of the ECG indicates ventricular excitation and contraction?

The QRS complex


What phase of the cardiac cycle is the heart in when all four valves of the heart are closed and ventricular pressure is building but is not yet great enough to open a valve?

That phase is called as isovolumetric contraction phase.


What happens when the AV valves are Ventricular contraction?

the valves close


What is second stimulus before relaxation causes increased force called?

Contraction phase


What phase of the cardiac cycle do ventricles contract?

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).