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Haemoglobin is made up of a protein called globin which is bound to a red pigment called heme (hence the name haemoglobin)

Globin is made up of 4 chains (polypeptide chains) embedded inside each of which is a heme molecule, the latter has an iron atom (in ferrous state) in it. It is the iron atom which carries a molecule of oxygen. As there are 4 chains this means that there are 4 iron atoms which means that 4 molecules of oxygen can be carried by each haemoglobin.

Globulin

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