The aortic valve is the semilunar valve located at the base of the aorta, which normally prevents blood from returning to the left ventricle. If it fails to close completely during ventricular diastole, blood may return to the left ventricle, causing the left ventricle to work harder. This condition is called aortic insufficiency.

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This is correct, aortic insufficiency occurs when the aortic valve does not close completely during diastole, causing blood to leak back into the left ventricle and potentially leading to increased workload for the heart.

The Aortic Valve Is the Semilunar Valve Located at the Base