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ELECTROLYTE BALANCE IN YOUR BODY: DISTRIBUTION OF ELECTROLYTES
Electrolytes are chemical compounds that can break up into their ions when dissolved in water. They are called electrolytes because they carry electrical charges. Cations carry positive electrical charges; anions carry negative electrical charges. For example, salt (NaCl) dissociates to sodium (Na+), a cation; and chloride (Cl-), an anion. The total cations are exactly equal to the total anions in an electrolyte solution. Electrolytes are essential for the regulation of water and acid-base balance.
The electrolytes in body fluids are measured in units called milliequivalents (mEq). Note that the cations exactly balance the anions. Note also that the principal cation in blood plasma and interstitial fluid is sodium, and the principal anion is chloride. Within the cells, however, the principal cation is potassium, and the chief anion is phosphate.
In health the concentrations of the electrolytes in the extracellular fluid and in the intracellular fluid are maintained within very narrow ranges. Very little sodium enters into the cell, and very little potassium leaves the cell into the interstitial fluid or the blood plasma. A change in the level of any of the electrolytes in the blood plasma has great significance in deciding upon the correct treatment in various disease conditions.
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