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Card 9 / 24:
How does myelin aid propagation of an action potential along an axon? How do the nodes of Ranvier help this process?
Myelin prevents the leak of current from the axon. Nodes of Ranvier allow the action potential to be regenerated at specific points along the axon. They also save energy for the cell since voltage-gated ion channels and sodium-potassium transporters are not needed along myelinated portions of the axon.
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