Measuring Lung Capacity
- Created by: Eleanor Izzard
- Created on: 04-01-13 10:37
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- Measuring Lung Capacity
- Elements of Lung Volume
- Dead Space - air in the bronchioles, bronchi and trachea - no gas exchange
- Residual Volume - volume of air that always remains in the lungs
- approx. 1.5dm^3
- Inspiratory Reserve Volume - how much more air can be breathed in, over and above the normal tidal volume
- Vital Capacity - largest volume of air that can be moved into and out of lungs in 1 breath
- approx. 5dm^3
- Expiratory Reserve Volume - how much more air can be breathed out over and above the normal tidal volume
- Tidal Volume - volume of air moved in and out of lungs with each breath when at rest
- approx. 0.5dm^3
- Spirometer
- consists of a chamber filed with oxygen that floats on a tank of water
- person breather from a disposable mouthpiece attached to a tube connected to the chamber
- breathing takes oxygen from the chamber, which then sinks down
- breathing out pushes air into the chamber, which floats up
- movements of the chamber are recorded using a datalogger so that a spirometer trace can be produced
- breathing out pushes air into the chamber, which floats up
- breathing takes oxygen from the chamber, which then sinks down
- person breather from a disposable mouthpiece attached to a tube connected to the chamber
- if someone breathes in and out of a spirometer over a long period of time, CO2 levels would build up to dangerous levels
- SODA LIME is used to absorb the CO2 as it enters the chamber
- so there will be an overall decrease in volume of the chamber, as oxygen is being taken and the CO2 being released does not go back in
- this allows us to make calculations on the oxygen use under different conditions
- so there will be an overall decrease in volume of the chamber, as oxygen is being taken and the CO2 being released does not go back in
- SODA LIME is used to absorb the CO2 as it enters the chamber
- consists of a chamber filed with oxygen that floats on a tank of water
- Elements of Lung Volume
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