Urine Concentration and Dilution · Physiology

Loop diuretics impair urine concentration by inhibiting:

  1. Aquaporin channels
  2. Na-K-2Cl transporter
  3. Sodium-glucose cotransporter
  4. Urea transporters
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Correct answer: Na-K-2Cl transporter

Loop diuretics block the Na-K-2Cl transporter in the thick ascending limb. This disrupts the medullary osmotic gradient.

Difficulty: Medium Question 19 of 20

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