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.

Question

Quizplus · Accepted Answer

When the semilunar valves are open, it means that blood is being pumped out of the ventricles and into the pulmonary artery and aorta. This occurs during ventricular systole. Therefore, choice D (ventricles are in systole) is a correct statement. However, during this time period, the AV valves are closed in order to prevent backflow of blood into the atria. Therefore, choice A (AV valves are closed) is also a correct statement. Choice B (blood enters the pulmonary artery and aorta) is also true because this is where the blood is being pumped to. However, choice C (ventricles are in diastole) is incorrect because the ventricles would be in systole when the semilunar valves are open.

Which of the Following Events Does NOT Occur When the Semilunar