Question

The inspiratory capacity is

a. the forced vital capacity of the lungs during the first 1 sec of an expiration.

b. the vital capacity minus the tidal volume

c. vital capacity minus residual volume - this is always smaller than the functional residual capacity.

d. tidal volume and inspiratory reserve volume - this should be larger than the functional residual capacity.

Which statement about lung ventilation rates is correct?

a. The alveolar ventilation rate is the total volume of air entering the alveoli and participating in gas exchange per minute.

b. The minute volume of respiration is the quantity of air moved in and out of the lungs with each breath.

c. During exercise, the minute volume of respiration decreases quite dramatically.

d. The forced vital capacity rate is the volume of air which can be inhaled and exhaled during exercise.

In an individual with airway obstruction, you would expect to see a ...

a. FEV1 of about 80% of the vital capacity

b. FEV1 about equal to the vital capacity

c. FEV1 of less than 80% of the vital capacity

d. FEV1 of greater than 80% of the vital capacity

Answer 1

1. ANSWER: Tidal volume and inspiratory reserve volume- this should be larger than the functuonal residual capacity.

Reason: Inspiratory capacity is the sum of tidal volume and inspiratory reserve volume. It is the volume of air that can be inspired after normal quiet respiration.

2. ANSWER: Alveolar ventilation rate is the total volume of air entering the alveoli and participating in gas exchange per minute.

Reason: Alveolar ventilation rate is measured in ml/min which is the total volume of air involving in gas exchange per minute.

3. ANSWER: FEV1 will be less than 80% of the vital capacity.

Reason: In obstructive lung disease, FEV1 will be less than 80% of the vital capacity whereas in restrictive lung disease it will decrease proportionately.