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All body fluid compartments contain water and solutes or electrolytes. The concentration of electrolytes depends on the fluid volume and the body’s ability to regulate the fluid:solvent ratio. The electrolytes are as follows:
Sodium (Na+)
Potassium (K+)
Chloride (Cl−)
Calcium (Ca+)
Magnesium (Mg+)
Phosphorus (P−)
Hydrogen (H+)
Bicarbonate (HCO3−)