Which of these statements concerning the functional characteristics of the heart chambers is NOT correct?
A) During ventricular diastole, blood collects in the right and left atria.
B) At the very beginning of ventricular diastole, blood flows directly from the atria into the relaxed ventricles.
C) 70% of ventricular filling occurs before the atria contract.
D) During ventricular systole, the atrioventricular valves close.
E) During ventricular diastole, the semilunar valves open.

Question

Quizplus · Accepted Answer

During ventricular diastole, the heart's ventricles relax and fill with blood. The semilunar valves (aortic and pulmonary valves), however, close during this phase to prevent the backflow of blood from the arteries into the ventricles. They open during ventricular systole when the ventricles contract and eject blood into the arteries.

Which of These Statements Concerning the Functional Characteristics of the Heart