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  4. Part of nephron impermeable to salt:

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Q. Part of nephron impermeable to salt:

Delhi UMET/DPMTDelhi UMET/DPMT 2006

Solution:

In descending limb of loop of Henie, water is reabsorbed due to increasing osmolality of interstitial fluid. Sodium and other solutes are not reabsorbed here. The filtrate become hypertonic to blood plasma. In ascending limb of loop of Henie, solutes $(Na, K, Ca, Mg, Cl )$ are reabsorbed whereas, it is impermeable to water. In distal convoluted tubule, there is active reabsorption of sodium ions from the filtrate under the influence of aldosterone. Collecting duct reabsorb the water and also $ Na^{+} $ under the influence of aldosterone.