Spirometer

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4 Terms

1
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Vital capacity

Max vol of air that can be exhaled/inhaled in a single breath.

Inspiratory reserve vol+expiratory reserve vol.

2
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Tidal volume

vol of air at each breath at rest.

Trough to peak e.g (0.5)

one single wave

3
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Breathing rate

Number of breaths per minute.

Calculate by counting number of peaks til 60 sec. e.g 5 breaths per minute

4
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Oxygen uptake

O2 used = CO2 produced.

  • soda lime is used in a spirometer so CO2 gradually decreases.

  • By calculating CO2 absorbed, it would be the same as oxygen uptake.

  • vol at start. (0) - vol at 60 sec

e.g 2.6 - 2.2 =0.4 dm3