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Deoxygenated blood enters the right atrium from the vena cava. Blood moves into right ventricle. Blood is pumped into the pulmonary artery.The pulmonary artery carries deoxygenated blood to the lungs.The blood becomes oxygenated in the lungs.Oxygenated blood leaves the lung via the pulmonary vein. Blood enters the left atrium.Blood moves into the left ventricle.Blood is pumped into the aorta, which carries oxygenated blood around the body.This unidirectional flow of blood through the heart shows that mammals have a double circulatory system.This means blood travels through the heart twice in one circulation of the body.
The right atrium receives blood from the vena cava (containing deoxygenated blood from the body).
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