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Q.

Which of the following statements is correct ?

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a

Saltatory conduction is seen in non-myelinated nerve fibres.

b

Nissl’s granuels are found in muscles fibres.

c

Non-myelinated nerve fibres do not possess nodes of Ranvier.

d

Myelinated nerve fibres are completely enclosed by a myelin sheath.

answer is C.

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Detailed Solution

Non-myelinated nerve fibres have no myelin sheath and hence no nodes of Ranvier. Nodes of Ranvier are spaces between myelin sheaths.

Saltatory conduction is observed in myelinated nerve fibres where myelin sheath acts as an insulator.

Nissl's granules are found in dendrites and cyton of the neurons.

Only axonal part of myelinated nerve fibres are enclosed in myelin sheath.

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