Breathing and Ventilation

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  • Created by: Tommy1boy
  • Created on: 08-05-15 10:11
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  • Ventilation and breathing
    • Breathing
      • Breathing In
        • 1) Rib cage moves out and up
        • 2) The diaphragm becomes flatter
        • 3) Increases the volume inside the thorax
        • 4) Reduces the pressure inside the thorax
        • 5) Air enters the lungs
      • Breathing Out
        • 1) The rib cage moves down and in
        • 2) The diaphragm moves upwards into a domed shape
        • 3) This reduces the volume and pressure inside the thorax
        • 4) Air leaves the lungs
    • Artificial ventilators
      • Overview
        • Used when someone is unable to breath by themselves
        • Carries a risk and so care must be taken
      • Manual ventilators
        • Often used in first aid
        • A mask is attached to a bag and is place over the mouth and nose
        • The bag can be squeezed, pushing air into the lungs
      • Mechanical ventilators
        • Negative pressure machines (Iron Lungs)
          • Used in cases of paralysis (due to polio for example)
          • Thorax is inside a metal box that can create a very low pressure outside the lung
          • This causes the thorax to expand so air enters the lungs
        • Positive pressure machines
          • These attach by a tube and mask to the mouth and nose
          • Used during surgery or when unconscious
          • Air enters the lungs under high pressure
          • More modern


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