The distribution of Na+ and K+ between intracellular and extracellular compartments is ________.
A. K+ mainly intracellular; Na+ mainly in extracellular
B. Na+ mainly intracellular; K+ mainly in extracellular
C. equal amounts of both ions, in both intracellular and extracellular fluids
D. little of either intracellular but large amounts of both extracellular
E. None of the choices are correct.
Answer: A
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