We can produce a concentrated urine. This is facilitated by a special mechanism. Identify the mechanism.

  • A
    Reabsorption from $PCT$
  • B
    Reabsorption from collecting duct
  • C
    Reabsorption/secretion in $DCT$
  • D
    Counter current mechanism in Henle's loop/vasa recta

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The descending limb of the loop of Henle is permeable to ........ .

The human kidneys produce urine that is approximately .......... times more concentrated than the initial filtrate.

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Which of the following factors is responsible for the formation of concentrated urine?

Explain the mechanism of concentration of the filtrate.

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