Urine Concentration and Dilution · Physiology

The descending limb of the loop of Henle is characterized by:

  1. Active sodium reabsorption
  2. Impermeability to water
  3. High permeability to water
  4. Active urea secretion
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Correct answer: High permeability to water

The descending limb is highly permeable to water but not to solutes. Water exits into the hyperosmotic medulla, concentrating tubular fluid.

Difficulty: Medium Question 3 of 20

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