Biology, 25.10.2019 22:43, tcjet

1)how do the walls of the atria compare with the walls of the ventricles? why are they different? ? 2)what keeps the heart valves from swinging in the wrong direction? 3)which artery is the largest? why? 4) what is the purpose of the coronary arteries? what results if there is a blockage of these arteries? ?

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1)how do the walls of the atria compare with the walls of the ventricles? why are they different? ?...