Gaseous Exchange

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  • Created by: NWILKA1
  • Created on: 29-05-14 14:55
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  • Gaseous Exchange
    • Lungs
      • Protected by the thorax
      • Protected by the ribcage
        • Protected by the thorax
      • Separated from the lower part of the body by the diaphram
    • What does the breathing system do?
      • Takes air into and out of the body
        • WHY?
          • So that oxygen from the air can diffuse into the bloodstream, and carbon dioxide can diffuse out of the bloodstream.
    • To make air move into the lungs, the ribcage moves out and up and the diaphram become flatter
      • These changes are reversed to make air move out of the lungs.
      • This is known as ventilation
        • These changes are reversed to make air move out of the lungs.
    • Lining of the airways
      • Cilia cells
        • To waft mucus up the nose so you can either swallow or spit it out
      • Mucus
        • To trap bacterial particles
    • Gas exchange surfaces
      • Effectiveness is increased by...
        • Being thin - short diffusion pathway
        • Having a large surface area (vill and alveoli)
        • Maintaining a large concentration gradient
          • Sufficient blood supply
          • Being ventilated

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