Most important intracellular cation -: (A) Na+, (B) K+, (C) Ca2+, (D) Mg2+
Answer is B. Ans. is 'b' i.e., K+ o In ECF, most abundant cation is Na+ and most abundant, anion is Cl-.o On the other hand, in ICF most abundant cation is K+ and most abundant anion is PO4-2 followed by protein.