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The gradient of osmolarity is mainly caused by NaCl.

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in Biology – Class 11 by (272k points)
The gradient of osmolarity is mainly caused by NaCl.

(a) True

(b) False

This question was addressed to me during an interview.

This interesting question is from Mechanism of Concentration of the Filtrate in chapter Excretory Products and Elimination of Biology – Class 11

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Correct answer is (b) False

The explanation is: The osmotic gradient is mainly caused by NaCl and urea. NaCl is transported by the ascending limb of Henle’s loop which is exchanged with the descending limb of the vasa recta.

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