A) sodium carbonate
B) carboxy haemoglobin
C) bicarbonate
D) \[C{{O}_{2}}\] as such
Correct Answer: C
Solution :
In dissolved state 7% of \[C{{O}_{2}}\] gets dissolved in the blood plasma and is carried in solution to lungs or about 0.3 ml of \[C{{O}_{2}}\] is transported per 100 ml of blood in dissolved state in blood plasma. In the form of bicarbonate about 70% of \[C{{O}_{2}}\] (about 2.5 ml per 100 ml of blood) received by blood from tissues, enters the RBCs where it reacts with water to form carbonic acid \[({{H}_{2}}C{{O}_{3}})\]. As carbaminohaemoglobin about 23% of \[C{{O}_{2}}\] is transported in combination with haemoglobin and plasma proteins. \[C{{O}_{2}}\] reacts directly with amine radicals \[(N{{H}_{2}})\] of haemoglobin to form an unstable compound carbamino- haemoglobin \[(Hb.\,C{{O}_{2}})\]. Sodium bicarbonate acts as buffer of blood.
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