Respiratory Systems-B5

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  • Created by: Shannon
  • Created on: 31-05-13 09:10
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  • Respiratory Systems
    • Amphibians are restricted to moist habitats: permeable skin to obtain oxygen
      • Excessive water loss could result in death
      • Fish obtain oxygen from water being forced over filaments, so they do not work in air
    • Vital capacity-maximum amount of air that can be exchanged
      • Tidal air-amount of air normally breathed in and out at rest
      • Residual air- air that cannot be forced out of the lungs
    • Gases exchange by diffusion between alveoli and air
      • Efficient exchange adaptations- large surface area, good blood supply, one cell thick
        • Readings are a measure of different lung capacities, help diagnose disease
    • Asthma attack-inflamed linings, mucus/fluid build up, bronchioles contract, narrowing the airways
      • Asbestosis-inflammation and scarring of lung tissue, resuce gaseous exchange
        • Chemical particles become trapped in air sacs
      • Cystic fibrosis- too much mucus from the bronchides
  • Fish obtain oxygen from water being forced over filaments, so they do not work in air

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