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What structure(s) reabsorb water and salt, making urine more concentrated?

Answer 1

Proximal convoluted tubule and Henle's loop of nephron and collecting ducts of kidney are all able to reabsorb either water or salt or both, making urine more concentrated.

Along the proximal convoluted tubule (PCT) water from filtrate passively enters blood by osmosis, because solutes are reabsorbed.

Water is also reabsorbed along descending limb of Henle, but not at all along ascending limb. On the other hand salt is reabsorbed along ascending limb of Henle, but not at all along descending limb.

NaCl is also reabsorbed by walls of PCT, and distal convoluted tubule (DCT) of nephron.

Reabsorption of water and salt continues in collecting ducts.

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Answer 2

Hudson Dean

The kidney's nephrons—more especially, the loop of Henle and the collecting duct—are the organs in charge of reabsorbing salt and water, which concentrates urine.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.