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K (potassium)
K (potassium): K is the symbol for potassium, the major positive ion (cation) found inside of cells. The chemical notation for potassium is K+.
The proper level of potassium is essential for normal cell function. An abnormal increase of potassium ( hyperkalemia ) or decrease of potassium (hypokalemia) can profoundly affect the nervous system and heart, and when extreme, can be fatal.
The normal blood potassium level is 3.5 - 5.0 milliEquivalents/liter (mEq/L), or in international units, 3.5 - 5.0 millimoles/liter (mmol/L).
See also: Potassium balance .
Last updated on 05/15/2008
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