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Nervous System — BIOLOGY STD 7 — Question

ICSE BoardEnglish MediumSTD 7BIOLOGYNervous System3 Marks
Question
Compare the nervous system and the endocrine system.
✓

Answer

A nerve is formed by a group of nerve fibres (axons) encased
by the tubular medullary sheath. The medullary sheath acts as insulation and does not allow mixing up of impulses of the neighbouring axons (nerve fibres) We have three kinds of nerves:
1.Sensory nerve: It brings impulses from sense organs as these have sensory fibres. These nerves carry the impulses from the sense organs to the brain or to the spinal cord as the optic nerve of the eye.
2.Motor nerves: These carry impulses to muscles or glands from the brain or spinal cord. These nerves have only motor fibres as nerves to the muscles of the eyeball.
3.Mixed nerve: It has both sensory and motors fibres as nerve going to the tongue.

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