During ventricular systole, The AV valves are open and the semilunar valves are closed while the ventricle contracts The AV valves are closed and the semilunar valves are open until sufficient pressure is generated in the ventricle to force the AV valves to close Blood flows passively from the atria and the ventricle fills with no change in ventricular volume O The aorta and pulmonary arteries are at the mean arterial pressure The AV valves are closed and the semilunar valves are closed until sufficient pressure is generated in the ventricle to force the semilunar valves open

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