Normal functioning of blood, Chemistry

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Q. Normal functioning of blood?

The sixth position marked by X is either occupied by H20 or 02 molecules. Impotant thing to note is that Fe2+ in hemoglobin does not get oxidised to Fe3+. On the ottier, tiahd if gaseous 02 is bubbled into an aqueous solution containing heme, the Fe2+ gets oxidised to Fe3+. It is believed that the oxidation of Fe2+ to Fe3+ is prevented by the bulky protein in the hemoglobin. Each helnoglobin can bind four 02 molecules to give a bright red complex.  When oxygen molecules are replaced by water molecules it gives a bluish coloured complex which is characteristic of venous blood. Both CO and CN- can form more stable complexes with Fe2+ ion than molecular oxygen. Thus they can destroy the normal functioning of blood as in oxygen carrier.

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