Solved UPSC CDS/OTA Question
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Q · Excretory Systemmedium · 45s
Which process primarily occurs in the proximal convoluted tubule?
TopicExcretory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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The proximal convoluted tubule reabsorbs approximately 65–70% of filtered Na⁺ and water, all glucose and amino acids, and most bicarbonate, through active and passive mechanisms essential for preserving body fluid composition.
Final Answer: Option B - Bulk reabsorption of water, ions, and nutrients