1.

The passage of which of the following makes the urine hypertonic?(a) Sodium ions(b) Urea(c) Glucose(d) Potassium ionsThe question was posed to me at a job interview.Asked question is from Function of Tubules-1 topic in division Excretory Products and Elimination of Biology – Class 11

Answer»

Correct answer is (b) Urea

Easiest explanation: In the last SEGMENT of the collecting duct, urea goes into the interstitial fluid, and there enters to ascending Henle’s loop which further comes to the interstitial fluid by collecting tubule and duct making the WHOLE collecting duct PERMEABLE for water and thus making the URINE hypertonic.



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