What are the intracellular and extracellular concentrations of calcium in the human body?

Updated: Dec 03, 2020
  • Author: Mahendra Agraharkar, MD, MBBS, FACP, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Ninety-eight percent of body calcium is found in the skeleton; this is closely related to the extracellular concentration of calcium. Intracellular calcium is less than extracellular calcium by a factor of 100,000. Intracellular processes, including the activity of many enzymes, cell division, and exocytosis, are controlled by intracellular calcium. The primary mediator of the intracellular effects of calcium is the calcium-binding regulatory protein, calmodulin.

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