What is the principal INTRACELLULAR cation? and What is the principal EXTRACELLULAR cation?

Question

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Answer 1

Principal intracellular cation- potassium (K+) Approx. conc = 140 mM

Principle extracellular cation- sodium (Na+) Approx conc = 145 mM

Na+ / K+ ATPase pump is responsible for maintenance of these ionic concentrations.

Answer 2

Potassium is the principal intracellular cation; it helps transport dextrose across the cell membrane and contributes to normal renal function