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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:

  • Types of Respiratory Surface
    • Body Surface
    • Gills
    • Tracheal System
    • Lungs
  • Characteristics of an Efficient Respiratory Surface

The respiratory surface is a special area that is developed in order to satisfy the requirements for gaseous exchange in larger organisms. Examples include external gills, internal gills, lungs, and the insect tracheae.

Body Surface:

1. Cell membrane: In simple unicellular organisms, such as Amoeba and Paramecium, the cell is close to the external environment. These organisms are small, and their surface area to volume ratio is large, literally, gaseous exchange occurs by diffusion across the surface membrane. These organisms do not have specialized structures for gaseous exchange to meet their oxygen demand.

 

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