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Q.
Which of the following equation shows the role of carbonic
anhydrase enzyme in the transport of carbon dioxide by
blood?
Breathing and Exchange of Gases
Solution:
Equation given in option a shows the role of carbonic
anhydrase enzyme in the transport of carbon dioxide by
blood. In erythrocytes the carbon dioxide combines with
water and is transported. Carbonic anhydrase, a zinc
containing enzyme assists rapid inter-conversion of carbon
dioxide and water into carbonic acid, protons and
bicarbonate ions. This enzyme catalyzes the decomposition
of carbonic acid into carbon dioxide and water, facilitating
the transfer of carbon dioxide from tissues to blood and
from blood to alveolar air.
$\underset{\text{carbon dioxide + water}}{CO _2+ H _2 O} \rightleftarrows \underset{\text{carbonic acid}}{H _2 CO _3} \rightleftarrows \underset{\text{bicarbonate + hydrogen ion}}{HCO _3^{-}+ H ^{+}}$