Solved UPSC CDS/OTA Question
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Q · Excretory Systemmedium · 45s
Which hormone increases sodium reabsorption in the distal tubule and collecting duct?
TopicExcretory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Aldosterone, secreted by the adrenal cortex, binds to intracellular receptors in principal cells, promoting synthesis of Na⁺ channels (ENaC) and Na⁺/K⁺-ATPase, increasing Na⁺ reabsorption (and water retention) and K⁺ secretion.
Final Answer: Option B - Aldosterone