The action potential is slower in myelinated neurons, because it has to travel the entire length of the axon rather than being able to jump from one node of Ranvier to the next.

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The action potential is actually faster in myelinated neurons because it can jump from one node of Ranvier to the next, known as saltatory conduction. This speeds up the propagation of the signal down the axon.

The Action Potential Is Slower in Myelinated Neurons, Because It