The more tightly hemoglobin binds oxygen, the more the curve is moved to the left. A decreased affinity for oxygen exists in hemoglobin, which causes the curve to be pushed to the right.
The iron atoms in the four heme groups and oxygen molecules have four binding sites on the hemoglobin molecule. Four oxygen molecules can thus be bound by each Hb tetramer. One can determine that 1 g of Hb can mix with 1.39 ml of oxygen based on the molecular weight of Hb.
Four globin chains make up hemoglobin, and each one has a haem molecule that attaches to oxygen in an irreversible manner. By causing structural changes in the nearby globin chains, the binding of oxygen to hemoglobin modifies oxygen affinity.
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