Multiple choice

Water is not reabsorbed in

  1. proximal convoluted tubule

  2. descending limb of loop of Henle

  3. ascending limb of loop of Henle

  4. distal convoluted tubule
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ascending limb of loop of Henle is impermeable to water. It actively transports sodium, potassium, and chloride ions from the tubular fluid into the medullary interstitium. Water reabsorption occurs in PCT (proximal convoluted tubule), descending limb (via osmosis), and DCT (distal convoluted tubule, regulated by ADH).

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