define axon and define myelin sheath
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1
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Axon :A long cylindrical part of nervous tissue.
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Explanation:
In a nerve cell ,there are projections/branches arising from cellbody(cyton) these are called DENDRITES
The longest branch is called as AXON.
AXON is covered with Mylein sheath.
Mylein sheat is made up of Fatty acids and proteins s ,it gives protein to axon
..
Between two consecutive mylein sheaths ,there is node of ranvier .This helps in passing the information.
Myelin is white in colour.
>>These are present in neurons/nerve cells.
>>The are longest cells in our body
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