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Selina Solutions Class 8 Biology Solutions for Exercise Long Answer Questions (LA) in Chapter 7 - Nervous System
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Q5) Describe three kinds of nerves, giving the example of each.
Answer:
Solution :
A nerve is formed of a bundle of axons (nerve fibres) enclosed in a tubular medullary sheath.This sheath over the axon acts like an insulation and prevents mixing of impulses in the adjacent fibres.
There are three kinds of nerves as described below:
- Sensory nerve: It contains only sensory neurons,it brings impulses from sense organs as these have sensory fibres.e.g.optic nerve of the eye.
- Motor nerve: It contains only motor neurons,these carry impulses to muscles or glands from the brain or spinal cord. e.g.nerves going to the muscles of the eyeball.
- Mixed nerve:It is the one which carries both sensory and motor neurons,e.g.the nerve which goes to the tongue.
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