This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Depolarization is due to 
Select and explain. 
A. Influx of sodium, B. Influx of potassium, C. Efflux of sodium, D. All
A: Influx of sodium
Answer: A: Influx of sodium 
Explanation: I depolarization negative internal charge becomes less negative This is due to opening of sodium gates Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:66,67