A) \[C{{O}_{2}}\]
B) CO
C) \[{{O}_{2}}\]
D) H
Correct Answer: B
Solution :
Haemoglobin is a complex heme protein. Its molecule is formed of four subunits each consisting of a coiled polypeptide chain and an iron-containing porphyrin ring. About 97% of \[{{O}_{2}}\] transported by blood is actually carried by haemoglobin of RBCs. Pure oxygen does not oxidise the iron of haemoglobin that is why this reaction is called the process of oxygenation rather than oxidation of haemoglobin. Oxygenated haemoglobin is called oxyhaemoglobin: \[H{{b}_{4}}+4{{O}_{2}}\xrightarrow{{}}Hb\,\,{{({{O}_{2}})}_{4}}\] About 23% of \[C{{O}_{2}}\] is transported by blood in form of carbamino compounds. \[C{{O}_{2}}\] directly and reversible reacts with haemoglobin loosely binding with it and forming an unstable compound called carbaminohaemoglobin. Carbon monoxide binds with haemoglobin at the same place where \[{{O}_{2}}\] binds but about 250 times more readily than \[{{O}_{2}}\] hence, it readily displace \[{{O}_{2}}\] from haemoglobin.
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