The period lasting from closure of the AV valve to opening of the aortic valve is known as

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The period lasting from closure of the AV valve to opening of the aortic valve is known as isovolumetric ventricular contraction. During this phase, the ventricles contract and pressure within them rises, causing the AV valves to close and preventing blood from flowing back into the atria. However, the aortic valve has not yet opened, so no blood leaves the ventricles yet. This results in the volume of blood in the ventricles remaining constant, or "isovolumetric".

The Period Lasting from Closure of the AV Valve to Opening