The Neuron and Neural Firing Practice Test

Demyelination prevents dendrites from receiving messages, but speeds axons because less insulation reduces resistance.

Demyelination makes action potentials graded, so weaker stimuli create smaller spikes that travel more slowly.

Demyelination makes synapses electrical-only, eliminating neurotransmitter delay and therefore speeding reactions.

Reduced saltatory conduction slows action potential propagation along axons because insulation between nodes is lost.