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Nervous System

ICSE · Class 10 · Biology

Quick revision notes for Nervous System — ICSE Class 10 Biology. Key concepts, formulas, and definitions for last-minute revision.

45 questions45 flashcards5 concepts

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A labeled diagram of the human vertebral column, showing the different regions (cervical, thoracic, lumbar, sacral, coccygeal) and the number of vertebrae in each, including fused bones.
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Key Topics to Revise

1

1. Neuron: Structure and Types

  • Neurons number over a trillion in man.
  • A neuron has four main parts: soma, dendrites, axon, and axon terminals.
  • The soma is also called cyton or cell body. It is star-shaped and contains a large centrally placed nucleus.
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2. Nerve Impulse and Synapse

  • The message transmitted by the axon is called a nerve impulse.
  • Nerve impulse transmission is an electrical phenomenon.
  • When there is no impulse, the axon membrane is positively charged outside and negatively charged inside. This is called polarization.
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3. Nerves, Ganglia, and Divisions of the Nervous System

  • A nerve is a bundle of axons enclosed within a common sheath.
  • Nerves are classified as sensory nerves, motor nerves, and mixed nerves.
  • Sensory nerves contain only sensory neurons and carry impulses from receptors to the brain or spinal cord.
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4. Brain: Main Parts and Functions

  • The adult human brain weighs about 1.3 kg and is enclosed in the cranium.
  • The brain is surrounded by three protective membranes called meninges: dura mater, arachnoid mater, and pia mater.
  • The space between the pia mater and arachnoid mater is filled with cerebro-spinal fluid.

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Key Concepts

A neuronThe somaDendrites are fibreThe axon is a long fibreThe myelin sheath is not

Frequently Asked Questions

What are the important topics in Nervous System for ICSE Class 10 Biology?
Nervous System covers several key topics that are frequently asked in ICSE Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Nervous System — ICSE Class 10 Biology?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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