A traveling nerve impulse does not depolarize the area immediately behind it, because:: (A) It is hyperpolarised, (B) It is refractory, (C) It is not self-propagating, (D) The conduction is always ohodromic
Answer is B. When an AP is initiated at a point, the point goes into refractoriness when the Na+ entered through that point has excited the adjacent (2nd) point. so it will travel in single direction Hyperpolarization event is after the refractory period.