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SS2: BIOLOGY - 2ND TERM

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  1. Mechanism of the Respiratory System | Week 1
    6 Topics
    |
    2 Quizzes
  2. Mechanism of Gaseous Exchange in Plants | Week 2
    1 Topic
    |
    1 Quiz
  3. Excretory Systems I | Week 3
    5 Topics
    |
    1 Quiz
  4. Excretory Systems II | Week 4
    4 Topics
    |
    3 Quizzes
  5. Nutrient Cycling in Nature I | Week 5
    3 Topics
  6. Nutrient Cycling in Nature II | Week 6
    2 Topics
    |
    1 Quiz
  7. Ecological Management | Week 7
    4 Topics
  8. Ecological Tolerance | Week 8
    2 Topics
    |
    1 Quiz
  9. Adaptation | Week 9
    3 Topics
    |
    1 Quiz

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Topic Content:

  • Mechanism of Breathing in Man
Mechanism of Breathing in Man

Inspiration / Inhalation:

When we breathe in the following events occur:

1. The pillar muscles of the diaphragm contract, thereby flattening the diaphragm i.e. it changes from a dome shape to a flat shape. The volume of the chest cavity increases.

2. At the same time the external intercostal muscles contract while the internal intercostal muscles relax.

 

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