G.F at the base of Henle’s loop is

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Isotonic

Hypotonic

Hypertonic

Insoluble

answer is C.

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Detailed Solution

Concept:In each nephron of the kidney, Henle's loop—a long, U-shaped loop—conducts urine in reptiles, birds, and mammals.
Many animals that dwell in arid climates, such as deserts, respond quite well to Henle's loops. Anatomically, the Henle loop can be divided into the ascending limb and the descending limb. Water from the vasa recta enters the interstitial fluid as a result of the increased solute content. When water is added, the isotonic glomerular filtrate becomes hypertonic and the urine increases in concentration from 300 milliosmoles to 1200 milliosmoles, or about 4 times more than human blood plasma.
Hence, option 3 is the correct answer.

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