Lung Volumes

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  • Lung Volumes
    • Spirometer
      • A chamber of medical grade oxygen floating on a tank of water. A chamber of soda lime.
        • Exhaled CO2 is absorbed by the soda lime, while allows the measure of 02 consumption
      • Precautions
        • Subject should be healthy (e.g. free from asthma)
        • Soda lime should be fresh and functioning
        • No air leaks in apparatus
        • Sterile mouthpiece
    • Vital capacity
      • The maximum volume of air that can be moved by the lungs in one breath
      • Depends on: Size, Age, Gender, Level of exercise
      • 2.5-5dm^3
    • Residual volume
      • Volume of air that remains in the lungs after forced expiration
      • 1.5dm^3
    • Tidal volume
      • Volume of air moved in and out of lungs with each resting breath
      • 0.5dm^3
    • Breathing rate
      • Number of breaths per minute
      • Can be measured by counting the peaks on a spirometer trace in one minute
    • Oxygen uptake
      • The volume of oxygen absorbed by the lungs in one minute
      • Can be measured by the decrease in the volume of air in the spirometer
      • An increase can result from an increased breathing rate and/or deeper breaths
  • A device that measures the movement of air in and out of lungs
  • -the relationship between vital capacity, tidal volume, breathing rate and oxygen uptake            -To include analysis and interpretation of primary and secondary data e.g. from a data logger or spirometer.


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