Lung Volumes and Capacities
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What are the 4 lung volumes?
What is Vt?
- Tidal Volume: Volume of air that is inhaled or exhaled from the lungs during effortless breathing
- 500 ml
What is IRV?
- Inspiratory Reserve Volume: Maximum volume of air that can be inhaled following a normal quiet inspiration
- 3100 ml
What is ERV?
- Expiratory Reserve Volume: Total amount of gas that can be exhaled from the lung following a normal quiet exhalation
- 1200 ml
What is RV?
- Residual Volume: Volume of gas remaining in the lungs after a complete exhalation
- 1200 ml
What are the 4 Lung Capacities?
What is TLC?
- Total Lung Capacity: Total amount of gas in lungs after a maximum inspiration
- 6000 ml
What is IC?
- Inspiratory Capacity: Max amount of air that can be inhaled from the resting end expiratory level or FRC; the sum of Vt and IRV
- 3600 ml
What is FRC?
- Functional Residual Capacity: Total amount of gas in lungs after a resting expiration; the sum of ERV and RV
- 2400 ml
What is VC?
- Vital Capacity: Total amount of air that can be exhaled after a maximum inspiration; the sum of IRV, Vt and ERV
- 4800 ml
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