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What is the purpose of the myelin sheath around an axon?

belongs to book: Examination Questions and Answers in Basic Anatomy and Physiology|Martin Caon|| Chapter number:14| Question number:21

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2022-10-19

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What is the purpose of the myelin sheath around an axon?

To control the chemical environment around the nerve cell.
To phagocytose microbes
To prevent movement of ions through the nerve cell membrane
To form the blood-brain barrier

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waelhammad

2022-10-19

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C: The myelin sheath insulates the axon. That is, it prevents ions from crossing the plasma membrane except at the nodes of Ranvier, where the sheath is absent

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