A) plasma
B) erythrocytes
C) leucocytes
D) nephrons
Correct Answer: B
Solution :
The dissolved carbon dioxide in the blood reacts with water to form carbonic acid. The reaction is slow in blood plasma, but occurs rapidly inside RBCs because a zinc containing enzyme, the carbonic anhydrase, present m. RBCs, accelerates its rate about 5000 times. Due to this, about 70% of \[C{{O}_{2}},\] received by blood from the tissues, enters the RBCs where it reacts with water to form carbonic add \[({{H}_{2}}C{{O}_{3}}).\] \[C{{O}_{2}}+{{H}_{2}}O{{H}_{2}}C{{O}_{3}}\] \[{{H}_{2}}C{{O}_{3}}{{H}^{+}}+HC{{O}_{3}}\]
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