Urine Concentration and Dilution · Physiology

Urea recycling mainly occurs between the:

  1. Proximal tubule and loop of Henle
  2. Ascending limb and distal tubule
  3. Collecting duct and loop of Henle
  4. Glomerulus and proximal tubule
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Correct answer: Collecting duct and loop of Henle

Urea diffuses from the inner medullary collecting duct into the loop of Henle. This recycling maintains high medullary osmolality.

Difficulty: Medium Question 7 of 20

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