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Neural Control and Coordination

ICSE · Class 11 · Biology

Quick revision notes for Neural Control and Coordination — ICSE Class 11 Biology. Key concepts, formulas, and definitions for last-minute revision.

64 questions48 flashcards5 concepts

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Illustrates the evolution of neural systems from simple nerve nets (e.g., Hydra) to more complex, centralized systems with a brain (e.g., human).
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Key Topics to Revise

1

1. Overview of the Neural System

  • The neural system of all animals is composed of highly specialised cells called neurons which can detect, receive and transmit different kinds of stimuli.
  • In mammals, the nervous system is divided into the central nervous system and the peripheral nervous system.
  • The central nervous system consists of the brain and spinal cord.
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2. Brain: Structure and Major Parts

  • The human brain is the central information processing organ of the body.
  • It weighs about 1,350 g in an average adult.
  • It is made up of about 1,000 billion neurons and neuroglia.
3

3. Spinal Cord and Spinal Nerves

  • The spinal cord is the downward continuation of the medulla oblongata.
  • It descends through the vertebral canal and ends at the lower border of the first lumbar vertebra.
  • The spinal cord has cervical and lumbar enlargements.
4

4. Nerve Fibres, Nerves and Synapse

  • Nerve fibres are axons or dendrites enclosed by a connective tissue sheath.
  • Nerve fibres are classified into myelinated and non-myelinated fibres.
  • Non-myelinated fibres lack a myelin sheath.

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Key Concepts

CoThe neural system of animalsThe central nervous system includesThe human brain weighs about 1The midbrain lies between the forebrain

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What are the important topics in Neural Control and Coordination for ICSE Class 11 Biology?
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Understand the core concepts first, then work through the 64 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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