What structure provides insulation for axons as action potentials move along?

What structure provides insulation for axons

Multiple choice — select the best answer

ASynapse
BIon channel
CDendrite
DMyelin sheath

✓ Correct answer: D. Myelin sheath The myelin sheath, composed of oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system, provides insulation for the axon. As an action potential travels down an axon it essentially jumps between nodes that are not covered by myelin (call nodes of Ranvier). The myelin sheath is very similar to the covering on an electric cord.

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What structure provides insulation for axons as action potentials move along?

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