Health, 12.11.2019 23:31, joslynndiggs

At the beginning of systole, when ventricular pressure exceeds atrial pressure, the av valves close and the semilunar valves also remain closed because the pressure within the ventricles is still not sufficiently strong to force them open. at this point there is no flow of blood in or out of the ventricles. this phase is known as

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At the beginning of systole, when ventricular pressure exceeds atrial pressure, the av valves close...