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Potassium ion is one of the most important cations in the body, the plasma concentration must be maintained within a certain range of the body in order to maintain normal function.
Normal potassium concentration and intracellular and extracellular potassium ratio is the decisive factor in maintaining neuromuscular stress, in addition to potassium ion is also involved in a variety of intracellular enzyme activity regulation. The total amount of potassium ions in the body of 3000-4000mmol, of which more than 98% of the distribution in the cells (especially muscle cells), 1.4% or so distributed in the extracellular, and plasma potassium ions accounted for only about 4% of the total.
Normal intracellular potassium concentration of 140-150mmol / L, extracellular (including plasma and interstitial fluid) is 3.5-5.5mmol / L. To maintain the balance of potassium in the body, we must first keep the total amount of potassium ions constant.
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