The semilunar valves close to prevent the backflow of blood into the ventricles.

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The function of the semilunar valves is to prevent the backflow of blood into the ventricles, specifically during ventricular diastole (relaxation phase). When the ventricles contract (ventricular systole), the valves open to allow blood to be pumped out of the heart, but when the ventricles relax, the valves close to prevent any backflow.

The Semilunar Valves Close to Prevent the Backflow of Blood