quick answer: generalized anxiety disorder.
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Answer:
A mineral nutrient is a substance required by organisms to perform nesecessary functions to live, so must be absorberd or ingested in the right amount.
Explanation:
The glial cells forming myelin sheaths are called oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system. The gaps (approximately 1 micrometer wide) formed between myelin sheath cells long the axons are called Nodes of Ranvier.
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