ABSTRACT
NB value ranges following each electrolyte denote serum concentration. = Similar in composition to plasma fluid owing to the permeability of the
capillary membrane to most dissolved substances except protein. = The main cation is sodium and the main anion is chloride. = Sodium (130140 mmol/L):
– Concentration is maintained by active transport by the sodium: potassium pump (3:2 ratio) on cell membranes.
