Multiple choice

Which of the following transporter molecules exchanges sodium for hydrogen ions in the proximal tubule of the kidneys?

  1. Na-K--2Cl

  2. ROMK

  3. 3Na+/2K+ ATPase

  4. NHE 3

  5. ENaC
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D Correct answer
Explanation

The NHE 3 is a counter transporter that exchanges sodium ions in the tubular fluid for hydrogen ions from the cell. This is a passive process, which like sodium reabsorption in most other tubular cells, occurs along the sodium concentration gradient which has been created by the 3Na+/2K+ ATPase.

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