Question

Does ion channels opens at each node of ranvier when an impulse pass or the impulse is passed only by the opening of ion channels at the end part of dentrites?

Answer 1

Nerve impulses have a domino effect. Each neuron receives an impulse and must pass it on to the next neuron and make sure the correct impulse continues on its path. Through a chain of chemical events, the dendrites (part of a neuron) pick up an impulse that’s shuttled through the axon and transmitted to the next neuron. The entire impulse passes through a neuron in about seven milliseconds — faster than a lightning strike.