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Match the following parts of a nephron with their function: Column-I: (A) Descending limb of Henle’s loop (B) Proximal convoluted tubule (C) Ascending limb of Henle’s loop (D) Distal convoluted tubule Column-II: (i) Reabsorption of salts only (ii) Reabsorption of water only (iii) Conditional reabsorption of sodium ions and water (iv) Reabsorption of ions, water and organic nutrients Select the correct option from the following:

1. (A)-(iv), (B)-(i), (C)-(iii), (D)-(ii)
2. (A)-(i), (B)-(iii), (C)-(ii), (D)-(iv)
3. (A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)
4. (A)-(i), (B)-(iv), (C)-(ii), (D)-(iii)

Correct answer: (A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)

Solution

The descending limb is permeable to water but not salts, so it reabsorbs water only. The PCT reabsorbs most ions, water, and organic nutrients; the ascending limb reabsorbs salts only; and the DCT shows conditional reabsorption of sodium ions and water under hormonal control.

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