When sodium enters cells: (A) There is spike in action potential, (B) There is plateau in action potential, (C) There is repolarization, (D) There is hyperpolarization
Answer is A. When sodium ion enter a cell the potential goes to the positive side and cause depolarization. There is a spike in action potential.(REF TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 26)