This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Inward flow of Na+ in hea leads to 
Select and explain. 
A. Plateu phase, B. Action potential, C. Repolarization, D. No change
B: Action potential
Answer: B: Action potential 
Explanation: Entry of Na ions into cardiac cell leads to depolarisation. (REF TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO 52)