Pulmonary Volumes and Capacities

Question 1

Tidal Volume (TV):

Answer 1

the volume of air exhaled normally after a typical inspiration.

Question 2

Expiratory Reserve Volume (ERV):

Answer 2

largest additional volume of air that one can forcibly expire AFTER expiring tidal air.

Question 3

Inspiratory Reserve Volume (IRV):

Answer 3

amount of air that can be forcibly inspired over and above a normal inspiration.

Question 4

Residual Volume (RV):

Answer 4

the amount of air that cannot be forcibly expired.

Question 5

Vital Capacity (VC):

Answer 5

largest volume of air an individual can move in and out of the lungs.

Question 6

What is the formula for Vital Capacity?

Answer 6

VC = IRV + TV + ERV

Question 7

Inspiratory Capacity (IC):

Answer 7

the maximal amount of air an individual can inspire after a normal expiration.

Question 8

What is the formula for Inspiratory Capacity?

Answer 8

IC = TV + IRV

Question 9

Functional Residual Capacity (FRC):

Answer 9

the amount of air left in the lungs after a normal expiration.

Question 10

What is the formula for Functional Residual Capacity?

Answer 10

FRC = ERV + RV

Question 11

Total Lung Capacity (TLC):

Answer 11

the total volume of air a lung can hold.

Question 12

Alveolar ventilation:

Answer 12

the volume of inspired air that actually reaches or ventilates the alveoli.

Question 13

Anatomical Dead Space:

Answer 13

air passage ways that contain air that does not reach the alveoli.

Question 14

Physiological Dead Space:

Answer 14

anatomical dead space + any alveolar dead space (obstructed or diseased alveoli)

Question 15

What is the formula for alveolar ventilation volume?

Answer 15

Alveolar ventilation volume = TV – dead space volume

Question 16

Total Minute Volume:

Answer 16

rate of pulmonary ventilation per minute.

Question 17

Forced Expiratory Volume (FEV):

Answer 17

maximum volume of air that can be breathed out.