Nervous System — Chapter Summary
ICSE · Class 8 · Biology
Summary of Nervous System for ICSE Class 8 Biology. Key concepts: Coordination is, A neuron and Sensory neurons carry impulses.
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Overview
The nervous system helps the body work in an organised way. It brings about coordination, which is the interlinking of body activities according to internal and external needs. The nervous system keeps a person aware of the surroundings, helps in thinking and remembering, controls voluntary actions,
Key Concepts
Coordination is the interlinking of activities
Coordination is the interlinking of activities of a living being according to the needs of the body internally or externally. It has two types: nervou
A neuron
A neuron, also called a nerve cell, is the structural and functional unit of the nervous system. It has two main parts: the cyton, which is the cell b
Sensory neurons carry impulses from sense
Sensory neurons carry impulses from sense organs to the spinal cord or brain. Motor neurons carry impulses from the brain and spinal cord to muscles a
A synapse is a small junction
A synapse is a small junction used for communication between two neurons. At the synapse, a neurotransmitter carries the message from the axon of one
A nerve is formed of
A nerve is formed of a bundle of axons enclosed in a tubular medullary sheath. The sheath works as insulation and prevents mixing of impulses in adjac
Learning Objectives
- Understand the meaning of coordination and the role of the nervous system
- Identify the structure and function of a neuron
- Distinguish between sensory, motor, and association neurons
- Explain how impulses pass through a synapse
- Classify nerves as sensory, motor, and mixed
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