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Saltatory and Non-Saltartory Conduction

In nerve fibr...

Question

In nerve fibre, the impulses transmit quickly due to

A

Myelin sheath

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B

Nodes of Ranvier

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C

Both (a) and (b)

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D

None of the above

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Solution

The correct option is C
Both (a) and (b)

In nerve fibres, the impulses transmit quickly due to myelin sheath and nodes of Ranvier. Three key functions of myelin sheath are:
(i) Protection of nerve fibre
(ii) Insulation of nerve fibre
(iii) Increases the rate of transmission of nerve impulses.

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Similar questions

Q. Read the following statements:
(i) Saltatory type of present in non-myelinated nerve fibres (axons) only
(ii) The nerve impulse generated at a point in the neuron faes resistances at sites where myelin sheath is present
(iii) Nodes of Ranvier of axon is exposed to ECF
(iv) In myelinated neurons, ion channels and transport pumps are absent in the nodes of Ranvier
(v) In myelinated nerve fibre, the nerve impulse travel as a continous wave of depolarisation
How many of the statements are correct?

Q. Assertion :Myelin sheath insulates nerve fibre and prevents its depolarization Reason: Nerve impulses are conducted more rapidly in non-myelinated fibres than myelinated ones

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. Assertion :Non-myelinated nerve fibres do not possess nodes of Ranvier. Reason: This is due to the absence of nissl's bodies in node of Ranvier.

Q. In a myelinated nerve fibre, the conduction of impulse is faster due to the presence of

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Saltatory and Non-Saltartory Conduction

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