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SS3: BIOLOGY - 1ST TERM

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  1. Regulation of Internal Environment I | Week 1
    6 Topics
    |
    1 Quiz
  2. Regulation of Internal Environment II | Week 2
    4 Topics
    |
    1 Quiz
  3. Regulation of Internal Environment III | Week 2 (Contd)
    3 Topics
    |
    1 Quiz
  4. Nervous Coordination I | Week 3
    2 Topics
    |
    1 Quiz
  5. Nervous Coordination II | Week 4
    4 Topics
    |
    1 Quiz
  6. Sense Organs I | Week 5
    6 Topics
    |
    1 Quiz
  7. Sense Organs II | Week 6
    3 Topics
    |
    1 Quiz
  8. Ecology of Population | Week 7
    3 Topics
    |
    1 Quiz
  9. Balance in Nature | Week 8
    3 Topics
    |
    1 Quiz
  10. Reproductive Systems and Reproduction in Man I | Week 9
    4 Topics
    |
    1 Quiz
  11. Reproductive Systems and Reproduction in Man II | Week 10
    3 Topics
    |
    1 Quiz
  12. Development of New Seeds | Week 11
    4 Topics
    |
    1 Quiz
  13. Fruits | Week 12
    3 Topics
    |
    1 Quiz



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Topic Content:

  • Central Nervous System (CNS)
  • Spinal Cord
  • Functions of the Spinal Cord
  • Brain
  • Functions of the Brain

The central nervous system consists of the brain enclosed in the skull and the spinal cord, a long narrow tube which runs through most of the length of the vertebral column in the neural canals.

Spinal Cord:

The spinal cord consists of thousands of neurones clustered to form a cylinder of nervous tissue, which runs down the length of the neural canal at the back of vertebrates.

It is enveloped within these membranes.

(i) The meninges.

(ii)The central/spinal canal.

spinal cord
Transverse section of the spinal cord

A transverse section of the spinal cord reveals that it has:

(i) White matter: This contains the axons of motor and sensory neurons.

 

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