The function of the AV valves is to
a. prevent backflow of blood into the atria during ventricular contraction.
b. prevent blood regurgitation back into the ventricles.
c. assist with blood flow to the lungs and aorta.
d. contribute to ventricular filling by atrial kick.
A
The AV valves are open during ventricular diastole (filling) and prevent backflow of blood into the atria during ventricular systole (contraction). Semilunar valves prevent the backflow of pulmonic and aortic blood back into the ventricles.
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