Red blood cells are the cells that contains red colour to the blood.It is a combination of oxygen and hemoglobin which in turn is a combination of iron and other materials.It picks up the oxygen from breathing air and carry that oxygen from the lungs to the trillion of cells in the blood.This oxygen released by the red blood cells helps in converting the nutrients in the food like meat and green vegetables to energy.This red blood cells also picks up the carbondioxide and carries it back to the lungs to be breathed out.
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13 years ago
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