Which valves prevent backflow into the ventricles?

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Multiple Choice

Which valves prevent backflow into the ventricles?

Explanation:
Semilunar valves are located at the exits of the ventricles—the aortic and pulmonary valves. They open to let blood be ejected into the aorta and pulmonary trunk during ventricular contraction, and then close when the ventricles relax. This closing prevents blood from flowing backward into the ventricles. The valves between the atria and ventricles (the atrioventricular valves) have the opposite job: they prevent backflow into the atria, not into the ventricles.

Semilunar valves are located at the exits of the ventricles—the aortic and pulmonary valves. They open to let blood be ejected into the aorta and pulmonary trunk during ventricular contraction, and then close when the ventricles relax. This closing prevents blood from flowing backward into the ventricles. The valves between the atria and ventricles (the atrioventricular valves) have the opposite job: they prevent backflow into the atria, not into the ventricles.

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