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Important questions on Neuron The Structural And Functional Unit Of Neural System

A typical neuron has a myelin sheath insulating its axon. It is formed from cells known as Schwann cells. Some nervous system disorders, such as adrenoleukodystrophy result from the deterioration of the myelin sheath.
Why is the myelin sheath important to the correct functioning of the neuron?

A
The surface of the myelin sheath carries many receptors for neurotransmitters, allowing the neuron to receive chemical signals
B
Gaps in the myelin sheath allow for saltatory conduction, where electrical impulses jump from one covered area to another
C
The myelin sheath blocks external signals that originate outside the neuron, preventing interference with nervous signal transmission
D
None of these
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Assertion

Unit of nervous tissue is cyton.

Reason

The nerve tissue is developed from ectoderm.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C
Assertion is correct but Reason is incorrect.
D
Assertion is incorrect but Reason is correct.
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In the following diagram label and shows which part of nerve cell?

A
-Axon and -Soma (Cell body)
B
-Axon and -Dendrite
C
-Soma (cell body) and -Axon
D
-Soma (cell body) and -Dendrite
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Medullated nerve fibre in axon is covered by

A
Neurolemma
B
Medullary sheath
C
Mitochondria
D
Both A and B
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Select the correct statement regarding the Schwann cells.

A
Surround axon of myelinated nerve fibre
B
Support muscle fibres
C
Found in Haversian system of bones
D
Form basement membrane of epithelium.
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Which is the correct match?

A
Dendrite - Accepts signal / stimulus
B
Dendrite - Sends signal / stimulus
C
Axon - Smallest part of neuron
D
Synaptic knob - Present at the end of dendron
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