Respiratory: Lung Volumes and Capacities

Question 1

What is tidal volume?

Answer 1

Volume of air entering or leaving the lungs in a single breath

Question 2

What is inspiratory reserve volume?

Answer 2

Extra volume of air that can be maximally inspired over and above the tidal volume

Question 3

What is inspiratory capacity?

Answer 3

Tidal volume plus inspiratory reserve volume

Question 4

What is expiratory reserve volume

Answer 4

Extra volume of air that can be actively expired by maximal contraction beyond the normal volume of air after a resting tidal volume

Question 5

What is residual volume

Answer 5

Minimim volume of air remaining in the lungs after a maximal expiration

Question 6

What is functional residual volume

Answer 6

Volume of air in the lungs at the end of a normal passive expiration ie. residual volume plus expiratory reserve volume

Question 7

What is vital capacity

Answer 7

Maximum volume of air that can be moved out during a single breath following maximal inspiration

Question 8

What is total lung capacity

Answer 8

maximum volume of air that the lungs can hold

Question 9

What is forced expiratory volume in one second ie dynamic volume

Answer 9

Volume of air that can be expired during the first second of expiration in a forced vital capacity determination

Question 10

What is the normal FEV1/FVC ration

Answer 10

more than 75 percent