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The main function of red blood cells is the transport of oxygen from the lungs to the body's cells. Red blood cells contain a protein called hemoglobin that actually carries that oxygen.n each molecule of hemoglobin there are four iron atoms. Each iron atom binds with one molecule of oxygen. The iron in hemoglobin is what gives blood its red color. Thirty-three percent of a red blood cell is hemoglobin. The normal concentration of hemoglobin is 15.5 grams per deciliter of blood in men.
Contains haemoglobin. Haemoglobin haemoglobin: The red protein found in red blood cells that transports oxygen round the body absorbs oxygen in the lungs and releases oxygen in the rest of the body. Does not contain a nucleus. Increases amount of space inside the cell for haemoglobin.