Oxygenated blood enters the left atrium from the pulmonary vein (1st), The oxygenated blood flows into the left ventricle, The oxygenated blood is pumped out of the heart through the aorta to the body, The cells of the body use oxygen and carbon-dioxide enters the blood, Oxygen-poor blood enters the right atrium .of the heart through the vena cava, The deoxygenated blood flows into the right ventricle, The deoxygenated blood is pumped out of the heart through the pulmonary artery to the lungs, In the lungs, oxygen enters the blood and carbon dioxide leave the blood

The Circulatory System

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