The tricuspid valve is the valve that is located between the right atrium and the right ventricle but it does not direct blood to the lungs, it stops blood from flowing back into the right atrium. The pulmonary valve does in a way push the blood to the lungs, but it is located between the right ventricle and the pulmonary artery, not the right atrium and right ventricle.
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The elastic artery absorb most of the shock when the heart ejects blood. The expansion stores energy; the recoil disperses this energy by moving blood further through the circulation.
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