Question

how does nerve impulse propagate ?


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Answer 1

Answer:

The transmission of a nerve impulse along a neuron from one end to the other occurs as a result of electrical changes across the membrane of the neuron. ... In addition to crossing the membrane through leakage channels, ions may cross through gated channels.

Answer 2

Answer:

Action potentials are generated within the axon according to the all-or-none principle

An action potential of the same magnitude will always occur provided a minimum electrical stimulus is generated

This minimum stimulus – known as the threshold potential (–55 mV) – is the level required to open voltage-gated ion channels 

If the threshold potential is not reached, an action potential cannot be generated and hence the neuron will not fire

Threshold potentials are triggered when the combined stimulation from the dendrites exceeds a minimum level of depolarisation

If the overall depolarisation from the dendrites is sufficient to activate voltage-gated ion channels in one section of the axon, the resulting displacement of ions should be sufficient to trigger the activation of voltage-gated ion channels in the next axon section