ANN-0084
QUESTION
The major cation of intracellular fluid is?
OPTIONS
(A) Na
(B) Mn
(C) K
(D) Mg
ANSWER
(C) K
EXPLANATION
Potassium is the major intracellular cation and is essential for membrane potential, nerve conduction and muscle function. Sodium is the principal extracellular cation, while magnesium has important intracellular roles but is not the major intracellular cation; manganese is a trace mineral.
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