Multiple choice

Which of the following statements is true regarding potassium ion in the kidneys?

  1. Potassium is the major extracellular ion.

  2. Within cells, the concentration of potassium is lower than that of sodium.

  3. Potassium excretion is regulated by altering potassium secretion.

  4. The 3Na+/2K+ ATPase pumps potassium out of cells.

  5. Specialised cells have potassium channels.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Potassium is freely filtered and then most of the filtered potassium is reabsorbed. Potassium excretion is then controlled by the secretion of potassium by the principal cells in the collecting ducts. 

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