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Myelinated and Unmyelinated Fibres

What is true ...

Question

What is true about unmyelinated nerve fiber?

A

Not enclosed by both Schwann cells and a myelin sheath.

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B

Enclosed by a Schwann cell that does not form a myelin sheath.

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C

Not enclosed by a Schwann cell but enclosed by a myelin sheath.

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D

Not found in the autonomous and the somatic neural system.

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Solution

The correct option is B Enclosed by a Schwann cell that does not form a myelin sheath.
Unmyelinated nerve fibres are those which are enclosed by Schwann cells however these Schwann cells do not form myelin sheath around the axon.
Unmyelinated nerve fibres are found in autonomous and somatic neural systems. Hence option b is correct in respect to unmyelinated nerve fibres.

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Similar questions

A myelinated nerve fibre is enveloped by Schwann cells, which form a myelin sheath around the axon.

An unmyelinated nerve fibre is not enclosed by a Schwann cell and hence does not form a myelin sheath around the axon.

Q. Consider the following statements and find out coorect option:
(a) Three are two types of axons, namely myelinated and non myelinated
(b) Myelinated nerve fibres found in autonomous and the somatic neural systems
(c) The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(d) The gap between two adjacent myelin sheaths are calleds nodes of Ranvier.
(e) Unmyelinated nerve fibre found in spinal and cranial nerves
(f) Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon.

Q. Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secretes adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cells that does not form a myelin sheath.
(iii) Spinal and cranial nerves are made of non-myelinated nerve fibres

Q. Consider the following statements and state true or false.
1. Synaptic cleft of neurons secrete adrenaline.
2. Myelinated nerve fibres and enveloped with Schwann cells, which form a myelin sheath around the axon.
3. Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
4. Spinal cord and cranial nerves are made up of non-myelinated nerve fibres.

Q. Is myelin sheath present around the Schwann cell or Schwann cells are present around myelin sheath?

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Myelinated and Unmyelinated Fibres

Standard XII Biology

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