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
Related Images
7726
2428
4320
243
717
96
100
141
Comments (0)
Explore
Post your homework questions and get free online help from our incredible volunteers