Oxygen is the vital component of all living being .In humans this is purified and transported by the lungs and cardiovascular system respectively. Generally the impure blood from all over the body enters the right side of the heart, from their it travels to lungs where the impure blood is converted to pure blood(deoxygenated blood to oxygenated blood).This oxygenated blood enters the left side of heart and distributed or circulated throughout the body.The entire functions of the organs thus receives pure blood and aid metabolism.
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