A) \[N{{H}_{3}}\]
B) \[{{O}_{2}}\]
C) \[C{{O}_{2}}\]
D) \[CO\]
Correct Answer: D
Solution :
Haemoglobin has maximum affinity with carbon monoxide. CO combines with haemoglobin more rapidly than oxygen t form carboxy haemoglobin. It has 200-250 times more affinity for haemoglobin as compared to oxygen. Formation of carboxyhaemoglobin decreases the overall \[{{O}_{2}}\] carrying capacity of blood to cell resulting into oxygen deficiency-hypoxia. Most of oxygen is transported in the form of oxyhaemoglobin. One molecule of haemoglobin readily combines with 4 molecules of oxygen. \[Hb+4{{O}_{2}}Hb{{O}_{2}}\] (oxyhaemoglobin) Formation of oxyhaemoglobin depends on pH, \[{{P}_{C{{O}_{2}}}}\] and temperature. Haemoglobin also has affinity for \[C{{O}_{2}}\]. About 23% of total blood \[C{{O}_{2}}\] is transported by loosely binding with haemoglobin forming a unstable compound called carbamino haemoglobin.
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