Spike in action potential of a nerve is due to which ions: (A) K+, (B) Na+, (C) Cl-, (D) All of the above
Answer is B. Na+ enters the nerve cell and K+ leaves it during the action potential, the number of ions involved is minute relative to the total numbers present. (Ref: Ganong&;s review of medical physiology; 23rd edition; pg: 85)