Urine Concentration and Dilution · Physiology

The maximum concentrating ability of human kidneys produces urine osmolality of approximately:

  1. About 300 mOsm/kg
  2. About 600 mOsm/kg
  3. About 900 mOsm/kg
  4. About 1200 mOsm/kg
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Correct answer: About 1200 mOsm/kg

Human kidneys can concentrate urine up to about 1200 mOsm/kg. This depends on intact countercurrent mechanisms and ADH action.

Difficulty: Medium Question 20 of 20

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