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Saltatory and Non-Saltatory Conduction

The medullary...

Question

The medullary sheath of the nerve fibre is interrupted at intervals by

A

Septa

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B

Nodes of Ranvier

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C

Synapses

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D

Glia

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Solution

The correct option is D Nodes of Ranvier
The medullary sheath of the nerve fibre is interrupted at intervals by Nodes of Ranvier. It is a periodic gap in the insulating sheath (myelin) on the axon of certain neurons that serves to facilitate the rapid conduction of nerve impulses. The action potential propagated by one node of Ranvier jumps at the next node along the axon, thereby enabling the action potential to travel rapidly along the fibre.
So, the correct answer is option B.

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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 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. Myelin sheath of nerve fibres is produced by

Q. The area where myelin sheath is absent in the nerve fibre is:

Q. Myelin sheath is not found around nerve fibres of.

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Saltatory and Non-Saltatory Conduction

Standard XII Biology

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