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What Is a Neuron

Differentiate...

Question

Differentiate between.

Myelinated and Unmyelinated nerve fibres.

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Solution

Myelinated nerve fibres Unmyelinated nerve fibres
Nerve fibres are covered by a myelin sheath.
Nerve fibres are not covered by a myelin sheath.
It consists of nodes of Ranvier and the speed of transmission of impulses is high.
Does not contain nodes of Ranvier and the speed of impulse transmission is low.
There is no loss of impulse during transmission.
There is a loss of impulse during transmission.

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Q. Give the difference between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre.

Q. At intervals, myelinated nerve fibres possess unmyelinated areas called ______.

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.

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. Which of the following statement(s) is/are true?
1. Somatic neural system transmit impulses from CNS to skeletal muscles.
2. Autonomic neural system transmits impulses from CNS to involuntary organs and smooth muscles.
3. Unmyelinated nerve fibres are found in spinal and cranial nerves
4. Myelinated nerve fibres are found in autonomous and the somatic neural systems.

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