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Question

White matter is composed of

A
Nerve cells
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B
Nerve fibres
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C
Ependymal cells
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D
None of the above
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Solution

The correct option is A Nerve fibres
White matter is composed of the nerve fibres or the axons that are surrounded with the Schwann Cells secreting the myelin sheath. As the myelin sheath is made up of the fats, it appears white in colour and the myelinated nerve fibres are called the white matter.
A. Nerve cells include the cyton and dendrites as well that are never myelinated.
B. Nerve fibres can be myelinated and form the white matter.
C. Ependymal cells are the glial cells.
Hence, the correct answer is 'Nerve fibres'

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