Lung Volumes and Capacities Flashcards
Total Lung Capacity (TLC) Normal amt for males and females?
amount of oxygen in lungs after max inspiration; normally 6 L for males and 4.2 L for females
Vital capacity (VC)
amount of gas that can be exhaled after max inspiration (inhale all the way and blow out)
Residual volume. How much of normal lung capacity?
vol of oxygen remaining in lungs after max exhalation; 20% of normal capacity
Formula for TLC?
vital capacity + residual
Tidal volume
inspiration or exhalation after normal breathing (at rest); 7-8% of TLC
Inspiratory residual volume
amount of gas that a person can inhale after tidal volume; 60% of TLC
Expiratory residual volume
amount of gas that an individual can exhale beyond tidal volume (“oxygen OUT plus some more”); 20% of TLC
Formula for vital capacity?
TV + IRV + ERV
Functional residual capacity (FRC) Makes up how much of the total lung capacity?
amount of gas remaining in the lungs after tidal expiration; 40% of TLC
What are 3 types of lung capacities?
- lung
- inspiratory
- functional residual
Lung capacities includes (4)
- inspiratory
- FRC
- VC
- TLC
Inspiratory capacity? How much of TLC?
total amount of air that one can breathe in starting at tidal volume expiration; 60% of TLC
Formula for inspiratory capacity? Example?
TV + IRV; breath taken before jumping into water
Why can’t functional residual capacity be measured directly with spirometry?
cannot be measured directly with spirometry because RV (residual volume) cannot be exhaled
Formula for functional residual capacity?
ERV + RV
