The pumping of the heart affects the alternate contraction and relaxation of the chambers of the heart. The upper chambers of the heart are called Atria and ventricles.
The heart has four chambers: two atria and two ventricles. The right atrium acquires oxygen-poor blood from the body and pumps it to the right ventricle.
The right ventricle pumps the oxygen-poor blood to the lungs. The left atrium accepts oxygen-rich blood from the lungs,it to the left ventricle.
Thus, Atria and ventricles involve the alternate contraction and relaxation of the chambers of the heart.
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