Solved UPSC CDS/OTA Question
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Q · Excretory Systemmedium · 45s
In the proximal tubule, the majority of bicarbonate reabsorption involves which enzyme?
TopicExcretory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Carbonic anhydrase catalyzes the reversible hydration of CO₂, facilitating HCO₃⁻ reclamation by converting filtered HCO₃⁻ and secreted H⁺ into CO₂, which diffuses into cells for reformation of bicarbonate.
Final Answer: Option A - Carbonic anhydrase