Final answer:
Nodes of Ranvier are gaps in the myelin sheath that facilitate rapid transmission of nerve impulses along the axon.
Explanation:
Nodes of Ranvier are the regularly spaced gaps in the myelin sheath along the axon that allow for the transmission of nerve impulses. These gaps enable nerve impulses to travel rapidly by jumping from node to node. The action potential is 'recharged' at these sites as it moves along the axon.
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