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What is the difference between an atrioventricular and a semilunar valve?

The valves between the atria and ventricles are called atrioventricular valves, while the valves at the bases of the large vessels leaving the ventricles are called semilunar valves. Is this true? Semilunar valves prevent blood from flowing back into the ventricles when the ventricles relax.

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