Electrolyte Balance

Extracellular fluids have relatively high concentrations of sodium (Na+), chloride (Cl-), and bicarbonate (HCO3-) ions. Intracellular fluid has relatively high concentrations of potassium (K+), magnesium (Mg+2), and phosphate (PO4-3) ions. Note: Charged ions can also be indicated by reversing the superscript notation (e.g., Mg+2).


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