Respiratory - from West's 8th ed Chapter 2 - Ventilation

Question 1

The only variable in the following list that cannot measured with a simple spirometer and stopwatch is:

A. Tidal volume.

B. Functional residual capacity.

C. Vital capacity.

D. Total ventilation.

E. Respiratory frequency.

Answer 1

B

Question 2

Concerning the pulmonary acinus:

A. Less than 90% oxygen uptake of the lung occurs in the acini.

B. Percentage change in volume of the acini during inspiration is less than that of the whole lung.

C. Volume of the acini is less than 90% of the total volume of the lung at FRC.

D. Each acinus is supplied by a terminal bronchiole.

E. The ventilation of the acini at the base of the upright human lung at FRC is less than those at the apex.

Answer 2

D

Question 3

In a measurement of FRC by helium dilution, the original and final helium concentrations were 10% and 6%, and the spirometer volume was kept at 5 liters. What was the volume of the FRC in liters?

A. 2.5

B. 3.0

C. 3.3

D. 3.8

E. 5.0

Answer 3

C

Question 4

A patient sits in a body plethysmograph (body box) and makes an expiratory effort against his closed glottis. What happens to the following: pressure in the lung airways, lung volume, box pressure, box volume?

Answer 4

D

Question 5

If CO2 production remains constant and alveolar ventilation is increased threefold, the alveolar PCO2 after a steady state is reached will be what percentage of its former value?

A. 25

B. 33

C. 50

D. 100

E. 300

Answer 5

B

Question 6

In a measurement of physiologic dead space using Bohr’s method, the alveolar and mixed expired PCO2 were 40 and 30 mm Hg, respectively. What was the ratio of dead space to tidal volume?

A. 0.20

B. 0.25

C. 0.30

D. 0.35

E. 0.40

Answer 6

B