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| Description: The valves of the heart open and close in response to pressure changes as the heart contracts and relaxes Right and left atrioventricular valves Prevent back flow from the ventricles into the atria Right and left semilunar valves Prevent back flow from the arteries into the ventricles Picture Stats: Views: 225 Filesize: 484.2kB Height: 447 Width: 1072 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=41011 |