Potassium:Themajorpositive ion (cation) found inside cells. The chemical notation forpotassiumis K+. The proper level of potassium isessentialfor normalcell函数。一个abnormalincreaseinpotassium (hyperkalemia) or decrease in potassium (hypokalemia) can profoundlyaffectthe nervous system and heart, and when extreme, can be fatal. The normalbloodpotassium level is 3.5'5.0 milliEquivalents/liter(mEq/L), or 3.5 international units.
