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Deoxygenated blood entering the heart through veins from the tissues of the body first enters the heart through the right atrium before being pumped into the right ventricle. The right atrium is one of the two atria of the heart, which function as receiving chambers for blood entering the heart.
Let's review. Your veins drain deoxygenated blood from your body tissues and return it to the heart. Small veins converge to form larger and larger veins, which eventually drain into the venae cavae. The venae cavae empties the deoxygenated blood into the right atrium of the heart. The venae cavae has two divisions.The superior vena cava resembles a drain that leads down into the heart.mall veins converge to form larger and larger veins, which eventually drain into the venae cavae. The venae cavae empties the deoxygenated blood into the right atrium of the heart. The venae cavae has two divisions. The superior vena cava resembles a drain that leads down into the heart.