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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.
The aorta carries oxygenated blood to the body. The pulmonary artery carries deoxygenated blood to the lungs and it is the only artery to carry deoxygenated blood. There are two veins associated with the heart.The vena cava, or great vein, carries deoxygenated blood back to the heart from the body.he pulmonary vein is the only vein to carry oxygenated blood which is on its way to the heart from the lungs. The diagram also shows you that the right and side of the heart, both atrium and ventricle, contains only deoxygenated blood.