Lung Volumes And Capacities

Question 1

Anatomic dead space (VD)

Answer 1

The volume that occupies the non-respiratory conducting airways

Question 2

Expiratory reserve volume (ERV)

Answer 2

Maximal volume of air that can be exhaled after a normal tidal exhalation (15% TLC)

Question 3

Forced expiratory volume (FEV)

Answer 3

Maximal volume of air exhaled in a specific period of time

Question 4

Forced vital capacity (FVC)

Answer 4

The volume of air expelled during a forced maximal expiration after a forced maximal inspiration

Question 5

Functional residual capacity (FRC)

Answer 5

the volume of air in the lungs after normal expiration (FRC= ER+RV) (40% TLC)

Question 6

Inspiratory capacity (IC)

Answer 6

Maximal volume of air that can use inspired after a normal tidal exhalation (IC= IRV+TV, 60% TLC)

Question 7

Inspiratory reserve volume (IRV)

Answer 7

Maximal volume that can be inspired after normal tidal volume inspiration (50% TLC)

Question 8

Minute volume ventilation (VE)

Answer 8

The volume of air expired in one minute (VE= TV x RR)

Question 9

Peak expiratory flow (PEF)

Answer 9

Max flow of air during the beginning of a forced expiratory maneuver

Question 10

Residual volume (RV)

Answer 10

Volume of gas remaining in the lungs at the end of a maximal expiration (25% TLC)

Question 11

Tidal volume (TV)

Answer 11

Total volume inspired/expired with each breath during quiet breathing (10% TLC)

Question 12

Total lung capacity (TLC)

Answer 12

Volume of air in lungs after maximal inspiration, sum of all lung volumes (TLC= RV+ VC or FRC+IC)

Question 13

Vital capacity (VC)

Answer 13

Volume change that occurs between maximal inspiration and maximal expiration (VC=TV+IRV+ERV, 75% TLC)