How Do Myelin Sheaths Increase the Speed with Which Action

question 80

Multiple Choice

How do myelin sheaths increase the speed with which action potentials are propagated along an axon?

• A) They increase the permeability of Na+ ions in the plasma membrane.
• B) They amplify the action potential by increasing sodium influx along the entire distance of the neuron.
• C) They insulate the axon, preventing K+ ions from exiting the neuron.
• D) They cause action potentials to "jump" down the axon rather than travel in a continuous path along every site on the axon.

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