This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cell Physiology and Intercellular Connections, Subject name: Physiology
Most important intracellular cation - 
Select and explain. 
A. Na+, B. K+, C. Ca2+, D. Mg2+
B: K+
Answer: B: K+ 
Explanation: 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.