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It then passes out of the right ventricle trought the pulmonary artery to the lungs. Here the blood gives up the waste carbon dioxide it is carrying the takes in fresh oxygen, whish is part of the necessary for the working of the body. This oxygenated blood is carried from the lungs in the pulmonary vein to the left atrium of the heart. From here, it passes throught the mitral valve into the left ventricle. Then it is pumped out of the left ventricle into the aorta. This great artery divides into many smaller arteries, which convey oxygenated blood all round the body.
When these smaller arteries reach, their destination they divide again into very thin - walled vessels called capillaries. Oxygen from the blood passes throught the walls of these capillaries to the body cells. Carbon dioxide, which is a waste product formed in the blood and waste carbon dioxide back to the right atrium of the heart via the
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