Solved UPSC CDS/OTA Question
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Q · Excretory Systemmedium · 45s
The majority of bicarbonate reabsorption occurs in:
TopicExcretory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Approximately 80–90% of filtered HCO₃⁻ is reabsorbed in the proximal tubule through Na⁺/H⁺ exchange and subsequent intracellular regeneration of bicarbonate.
Final Answer: Option C - Proximal tubule