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BIOLOGY FORM 5 CHAPTER 1: 1.1 IMPORTANCE OF A CIRCULATORY SYSTEM

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BIOLOGY FORM 5 CHAPTER 1: 1.1 IMPORTANCE OF A CIRCULATORY SYSTEM

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BIOLOGY FORM 5 CHAPTER 1: 1.1 IMPORTANCE OF A CIRCULATORY SYSTEM

  1. 1. BIOLOGY FORM 5 chapter 1 - Transport 1.1 : Importance of a transport system
  2. 2. Learning Objectives  1.1 Understanding the importance of having a transport system in some multicellular organisms
  3. 3. Dimension of cube (cm) 1 x 1 x 1 2 x 2 x 2 4 x 4 x 4 Total surface area of cube (cm2) Volume of cube (cm3) TSA/V ratio Calculate the TSA/V ratio.
  4. 4. • Three cubes of agar are prepared which contain the indicator phenolphthalein. • These are placed in hydrochloric acid which will diffuse into the cubes. • As it diffuses in it will turn the indicator colourless. 3cm 3cm 2cm 2cm 1cm 1cm
  5. 5. • As the size of the cube increases the surface area to volume ratio decreases. 3cm 3cm 2cm2cm1cm 1cm Width of cube (cm) Surface area (cm2) Volume (cm3) Surface area: volume 1 6 1 6 2 24 8 3 3 54 27 2
  6. 6. • The cubes look like this after a few minutes. • If these were real cells then the bigger cell would not have received what it needs to all parts of the cell. • Therefore it would need a bigger surface area in order to rely on diffusion. 3cm 3cm 2cm 2cm 1cm 1cm
  7. 7. • Watch this video to see the experiment in action.
  8. 8. How to circulate substances? AMOEBA No Specialized Circulatory System
  9. 9. Amoeba
  10. 10. • In larger multicellular organisms need a transport system so that dissolved materials could be moved rapidly to and from all parts of the body.

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