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Myelinated and Unmyelinated Fibres

The velocity ...

Question

The velocity of action potential propagation

A

Is independent of an axon's diameter

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B

Depends on the thickness of the myelin around the axon

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C

Will be unaffected if the axon becomes demyelinated

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D

Is fastest in non-myelinated axons.

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Solution

The correct option is B Depends on the thickness of the myelin around the axon
The velocity of conduction of action potential propagation is fastest in large diameter myelinated axons than in unmyelinated axons. In myelinated fibres, conduction velocity is directly proportional to the thickness of the myelin sheath.

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Q. Action potentials propagate more rapidly along the myelinated axons than along the non-myelinated axons because of the uneven distribution of:

Q. Differentiate between :
Myelinated and non-myelinated axons

Differentiate between:

(a) Myelinated and non-myelinated axons

(b) Dendrites and axons

(c) Rods and cones

(d) Thalamus and hypothalamus

(e) Cerebrum and cerebellum

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. The myelin sheath around axon is formed by:

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