The point at which vena cava drains blood to the right atrium
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The Deoxgenated blood enters the Heart through Superior and Inferior Vena Cava in right atrium . When the Heart relaxes, right atrium expands and blood enters into it. When Heart contracts the veins inside heart prevents the backflow of the blood. When the Heart relaxes once again, Blood enters right ventricle. Through right ventricle blood is supplied to lungs or purification via Pulmonary Artery.
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