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Question

Unmyelinated axons differ from myelinated in that they

A
Are more excitable
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B
Lack nodes of Ranvier
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C
Are not capable of regeneration
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D
Are not associated with Schwann cells
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Solution

The correct option is B Lack nodes of Ranvier
Myelin sheath is discontinuous because of the presence of nodes of Ranvier. Nodes of Ranvier, the periodic gap in the insulating sheath (myelin) on the axon of certain neurons that serves to facilitate the rapid conduction of nerve impulses. However, nodes of Ranvier interrupt the insulation at intervals, and this discontinuity enables impulses to jump from node to node in a process known as saltatory conduction. Whereas unmyelinated axons (axon is not covered with myelin sheath) lack nodes of Ranvier and makes it different from the myelinates axon.

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