Which of the following events does NOT occur when the semilunar valves are open?
A) AV valves are closed.
B) Blood enters the pulmonary artery and aorta.
C) Ventricles are in diastole.
D) Ventricles are in systole.
C
Explanation:
A) When the semilunar valves are open, the AV valves are closed.
B) Blood does enter the pulmonary artery and the aorta when the semilunar valves are open.
D) The ventricles are in systole when the semilunar valves are open.
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