What is potassium?

Updated: Dec 06, 2018
  • Author: Eleanor Lederer, MD, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Answer

Potassium, the most abundant intracellular cation, is essential for the life of an organism. Potassium homeostasis is integral to normal cellular function, particularly of nerve and muscle cells, and is tightly regulated by specific ion-exchange pumps, primarily by cellular, membrane-bound, sodium-potassium adenosine triphosphatase (ATPase) pumps. [3]


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