The semilunar valves prevent the backflow of blood into the atria when the ventricles are contracting.

Name: The semilunar valves prevent the backflow of blood into the atria when the ventricles are contracting.
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The semilunar valves prevent the backflow of blood into the ventricles from the arteries (aorta and pulmonary artery) when the ventricles are relaxing, not into the atria. The atrioventricular valves (tricuspid and mitral valves) prevent backflow into the atria when the ventricles contract.

The Semilunar Valves Prevent the Backflow of Blood into the Atria