Gas Exchange mindmap

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  • Created by: sam
  • Created on: 25-04-13 19:58
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  • Gas Exchange
    • Thorax
      • pressure changes
        • Diaphram flattens, ribcage moves up and out
          • Increase of volume causes decrease in pressure
            • Air from an area of high pressure (outside of lungs) moves to an area of low concentration (inside of lungs)
        • diaphram arches, ribcage moves in and down
          • Decrease in volume causes increase in pressure
            • Air from an area of high pressure (inside lungs) moves to an area of low pressure (outside of lungs)
    • Alveoli
      • Gas exchange surface in mammals/birds
      • Adapted to maximise effectiveness
        • Very large surface area
        • Moist lining to dissolve gases( if oxygen gets in blood can be deadly)
        • Very thin walls (1 cell thick)
        • Good blood supply, arteries run all over them
    • Stomata
      • Allows
        • O2 to diffuse out of leaf
        • Water vapour to diffuse out of leaf
        • CO2 to diffuse into the leaf
    • Evaporation of water
      • This is affected by
        • Air currents
          • If the air currents are weaker( if its a still day)
            • The evaporation rate will be lower
          • If the air currents are stronger( if its windy)
            • The evaporation rate will be greater
        • Temperature
          • If the temperature is higher
            • the evaporation rate will be greater
          • If the temperature is lower
            • the evaporation rate will be lower
        • Humidity
    • Diffusion
      • Diffusion is the movement of particles from an area of high concentration to an area of low concentration
        • Across a partially permeable membrane
      • Osmosis
        • Active Transport
          • the movement of particles from an area of low concentration to an area of high concentration
          • Requires energy
        • The movement of water molecules from  an area of high concentration(weak solute solution) to an area of low concentration( stronger solute solution)
          • Across a partially permeable membrane
    • Exchange surfaces
      • Adaptations to maximise effectiveness
        • Large surface area
          • Has more area to diffuse through
        • Short diffusion pathway
          • Less distance for molecules to diffuse through
        • Good blood supply
        • Ventilation
          • Important to maintain concentration gradient
  • Thorax
    • pressure changes
      • Diaphram flattens, ribcage moves up and out
        • Increase of volume causes decrease in pressure
          • Air from an area of high pressure (outside of lungs) moves to an area of low concentration (inside of lungs)
      • diaphram arches, ribcage moves in and down
        • Decrease in volume causes increase in pressure
          • Air from an area of high pressure (inside lungs) moves to an area of low pressure (outside of lungs)
  • Key
    • Animals
    • Plants
    • Seperate topic
    • General

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