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B
Non-medullated nerve fibre
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C
Muscle fibre
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D
Medullated and non-medullated nerve fibres
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Solution
The correct option is A Medullated nerve fibre Medullated nerve fiber is also known as myelinated nerve fiber. The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. The gaps between two adjacent myelin sheaths are called nodes of Ranvier.
So, the correct answer is 'medullated nerve fibre.'