A travelling nerve impulse does not depolarize the area immediately behind it, because:: (A) It is hyperpolarized, (B) It is refractory, (C) It is not self-propagating, (D) The condition is always orthodromic
Answer is B. 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"