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Statemeent A: carbonic anhydrase present...

Statemeent A: carbonic anhydrase present in RBCs facililates the formation of bicarbonate ions at tissue level. Statement B: The same enzyme facilitates the formation of CO_2 in RBCs at alveoli level.

A

both statements are correct

B

statement A is correct and B is incorrect

C

statement A is incorrect and B is correct

D

both statements are incorrect

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the statements regarding carbonic anhydrase, we will break down the processes described in each statement step by step. ### Step 1: Understanding Statement A - **Statement A** claims that carbonic anhydrase present in red blood cells (RBCs) facilitates the formation of bicarbonate ions at the tissue level. - In tissues, carbon dioxide (CO₂) produced by cellular respiration diffuses into the RBCs. - Inside the RBCs, CO₂ reacts with water (H₂O) to form carbonic acid (H₂CO₃) through the action of carbonic anhydrase. - Carbonic acid then dissociates into bicarbonate ions (HCO₃⁻) and hydrogen ions (H⁺). - Therefore, Statement A is correct. ### Step 2: Understanding Statement B - **Statement B** states that the same enzyme (carbonic anhydrase) facilitates the formation of CO₂ in RBCs at the alveoli level. - In the alveoli, the process is reversed. Bicarbonate ions (HCO₃⁻) that were formed in the tissues re-enter the RBCs. - Inside the RBCs, bicarbonate ions combine with hydrogen ions to form carbonic acid (H₂CO₃). - Carbonic acid then dissociates into water (H₂O) and carbon dioxide (CO₂), which is released into the alveoli to be exhaled. - Thus, Statement B is also correct. ### Conclusion Both statements A and B are correct regarding the role of carbonic anhydrase in the formation of bicarbonate ions at the tissue level and the formation of carbon dioxide at the alveoli level.
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Knowledge Check

  • Which of the following statement // s is // are correct ? A- A high concentration of carbonic anhydrase is present in RBC. B- Minute quantities of carbonic anhydrase is present in plasema. C-Every 100 ml blood delivers approximately 4 ml of CO_(2) to the alveoli. D- 20-25% CO_(2) is carried by haemoglobin as carbaminohaemoglobin.

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