Absorption mechanisms · Physiology

Which absorption mechanism explains oral rehydration therapy effectiveness?

  1. Glucose-driven sodium absorption
  2. Passive diffusion of water alone
  3. Active chloride secretion into lumen
  4. Bicarbonate secretion by enterocytes
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Correct answer: Glucose-driven sodium absorption

Glucose enhances sodium absorption via SGLT1. Water follows osmotically, improving hydration.

Difficulty: Medium Question 18 of 40

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