Neurons Communicate with Each Other Through Electrical Signals Called Action

Neurons communicate with each other through electrical signals called action potentials.All of these statements are true regarding action potentials EXCEPT _____.

A) signals are passed by the successive firing of action potentials
B) K⁺ and Na⁺ are important ions in the nervous system
C) positive ions move into and out of the axon as the signal is passed
D) K⁺ and Na⁺ ions are produced by the glial cells
E) the myelin sheath prevents ions from leaking across the axon membrane