- Refers to the volume of gas in the lungs at a given time during the respiratory cycle.
- Lung capacities are derived from a summation of different lung volumes.
- The average total lung capacity of an adult human male is about 6 litres of air.
- Volumes vary with depth of respiration, ethnicity, gender, age, body composition and respiratory diseases.
- Some lung volumes can be measured by Spirometry- Tidal volume, Inspiratory reserve volume, and Expiratory reserve volume.
- Others cannot: Residual volume, Functional residual capacity, and Total lung capacity
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