The insulation around a neuron's axon that has an effect on the speed of the action potential is called the

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The myelin sheath is a layer of insulation made up of fatty substances, which wraps around the axon of a neuron. The myelin sheath allows for faster transmission of nerve impulses, as it acts as a sort of electrical insulator, preventing electrical current from leaving the axon and forcing it to jump from one node of Ranvier to the next.

The Insulation Around a Neuron's Axon That Has an Effect