Assertion :At the tissue level, 70 the of $C O_{2}$ formed from catabolism is trapped as bicarbonate in the RBCs. Reason: At the tissue level, carbonic anhydrase in RBCs facilitates the formation of $C O_{2}$ and $H_{2} O$ from bicarbonate.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
RBCs contain a very high concentration of carbonic anhydrase enzyme which facilitates the following reaction in both directions. At the tissue site where the partial pressure of $C O_{2}$ is high due to catabolism, $C O_{2}$ diffuses into blood (RBCs and plasma) and forms $H C O_{3}^{-}$ and H+. At the alveolar site where P $C O_{2}$ is low, the reaction proceeds in the opposite direction leading to the formation of $C O_{2}$ and $H_{2} O$ .

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Assertion :At the tissue level, 70 the of CO2 formed from catabolism is trapped as bicarbonate in the RBCs. Reason: At the tissue level, carbonic anhydrase in RBCs facilitates the formation of CO2 and H2O from bicarbonate.

Assertion :At the tissue level, 70 the of $C O_{2}$ formed from catabolism is trapped as bicarbonate in the RBCs. Reason: At the tissue level, carbonic anhydrase in RBCs facilitates the formation of $C O_{2}$ and $H_{2} O$ from bicarbonate.