Lung Volumes and Capacities Flashcards
(25 cards)
Volume of gas that can be forcibly inhaled after a tidal inhalation
Inspiratory reserve volume (IRV)
Inspiratory Reserve Volume (ml)
3,000 mL
Volume of gas that enters and exits the lungs during tidal breathing
Tital volume (TV)
TV (ml)
350-500 mL
Volume of gas that can be forcibly exhaled after a tidal exhalation
Expiratory Reserve Volume
Expiratory Reserve Volume (ERV) ml
1100 mL
Volume of gas that remains in the lungs after a complete exhalation
Can’t be exhaled from lungs
Residual volume
Residual volume (ml)
1200 mL
The volume above residual volume where the small airways begin to close
Closing volume
Closing volume (ml)
Variable
(30% TLC at age 20)
(55% TLC at age 70)
IRV + TV + ERV + RV
Total lung capacity
Total lung capacity (ml)
5800 ml
IRV + TV + ERV
Vital capacity
Vital capacity (ml)
4500
IRV + TV
Inspiratory capacity
Inspiratory capacity (ml)
3500 ml
RV + ERV
The lung volume at end expiration
Functional residual capacity (FRC)
Functional residual capacity (FRC) ml
2300 ml
RV + CV
Absolute volume of gas contained in the lungs when small airways close
Closing capacity
Closing capacity (ml)
Variable
Forced vital capacity (FVC) ml
5000 ml
Max inhalation/expiration
Forced vital capacity (FVC)
FVC in 1st second
FEV1
FEV1 normal value
4000 mL
