The aortic and pulmonary semilunar valves prevent backflow of blood from the:
A)ventricles to the atria when the ventricles relax
B)arteries to the ventricles when the ventricles contract
C)ventricles to the atria when the ventricles contract
D)arteries to the ventricles when the ventricles relax

Question

Quizplus · Accepted Answer

The aortic and pulmonary semilunar valves are located at the bases of the aorta and the pulmonary artery, respectively. They prevent the backflow of blood from these arteries back into the ventricles when the ventricles relax after contraction.

The Aortic and Pulmonary Semilunar Valves Prevent Backflow of Blood