A travelling nerve impulse does not depolarize the area immediately behind it, because:
Ans. is 'b' i.e. It is refractory Ganong writes -"Once initiated, a moving impulse does not depolarize the area behind it to the firing level, because this area is refractory"
It is hyperpolarized
It is refractory
It is not self-propagating
The condition is always orthodromic
Nerve Physiology