This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Insulin causes intracellular shift of which of the following ion? 
Select and explain. 
A. Na+, B. K+, C. Chloride, D. Calcium
B: K+
Answer: B: K+ 
Explanation: Ans. B. K+Insulin lowers serum K+ concentration i.e., causes hypokalemia.The hypokalemic action of insulin is due to stimulation of K+ intake by the cells mainly in muscle and adipose tissue.Insulin increases the activity of Na+ - K+ ATPase in cell membrane, so that more K+ is pumped into cells.