The heart has four valves that control the flow of blood. two of the valves (the av valves) normally prevent blood from flowing upwards. the other two valves (semilunar valves) normally prevent blood from flowing downwards. the av valves and semilunar valves have different shapes. which principle of anatomy and physiology does this example represent?
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The heart has four valves that control the flow of blood. two of the valves (the av valves) normally...
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