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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:

  • Functions of the Skin
  • Regulation of Body Temperature by the Skin

Functions of the Skin:

1. Protection: The skin protects the body against mechanical injury, ultraviolet rays of the sunlight, desiccation, and invasion by bacteria/germs.

2. Excretion and Osmoregulation: Excess water in sweat glands is excreted alongside other nitrogenous waste substances including urea.

3. Sensitivity: Different sense receptors are present in the skin. These receptors are sensitive to different environmental stimuli such as pain, touch, pressure, etc.

4. Production of Vitamin D: The skin manufactures vitamin D by using infrared rays of sunlight.

5. Mammary Glands are Present in the Skin. They are modifications of the skin. They help to produce milk for feeding young ones.

 

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