During systole the semilunar valves are open.

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Multiple Choice

During systole the semilunar valves are open.

During systole the ventricles contract and raise their pressure above the pressure in the aorta and pulmonary artery, causing the semilunar valves to open so blood can be ejected into these great vessels. At the same time, the atrioventricular valves are closed to prevent backflow into the atria. Early in systole there is a brief phase when all valves are closed (isovolumetric contraction), but once ventricular pressure exceeds arterial pressures, the semilunar valves open and ejection begins.

During systole the ventricles contract and raise their pressure above the pressure in the aorta and pulmonary artery, causing the semilunar valves to open so blood can be ejected into these great vessels. At the same time, the atrioventricular valves are closed to prevent backflow into the atria. Early in systole there is a brief phase when all valves are closed (isovolumetric contraction), but once ventricular pressure exceeds arterial pressures, the semilunar valves open and ejection begins.

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