During Ventricular Diastole ________

Question

During ventricular diastole ________.
A) only the AV valves open
B) only the AV valves close
C) only the semilunar valves close
D) the semilunar valves close and the AV valves open
E) the semilunar valves open and the AV valves close

Accepted Answer

During ventricular diastole, the ventricles are relaxed and the pressure inside them is low. As a result, the semilunar valves close to prevent the backflow of blood from the arteries into the ventricles, while the AV valves open to allow blood to flow from the atria into the ventricles. Therefore, choice D is the correct answer.