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Potassium is the main intracellular ion for all types of cells. In metazoa K+ intracellular concentration is much higher than its extracellular concentraion. In this sense K+ is somewhat opposite to Na+, for which situation is of the opposite. The normal level of extracellular potassium ranges from 3.5 to 5.5 mEq/L, although the optimum adult level is 4.5 mEq/L.

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