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Chapter 15. Toxic Responses of the Respiratory System

Which of the following statements is FALSE regarding the role of mucus in the conducting airways?

a. Pollutants trapped by mucus can be eliminated via expectoration or swallowing.

b. Mucus is of a basic pH.

c. The beating of cilia propels mucus out of the lungs.

d. Mucus plays a role promoting oxidative stress.

e. Free radical scavenging is believed to be a role of mucus.

Respiratory distress syndrome sometimes affects premature neonates due to lack of surfactant production by which of the following cell types?

a. lung fibroblasts.

b. type II pneumocytes.

c. endothelial cells.

d. alveolar macrophages.

e. type I pneumocytes.

In a situation where there is an increased metabolic demand for oxygen, which of the following volume measurements will greatly increase?

a. total lung capacity (TLC).

b. residual volume (RV).

c. functional residual capacity (FRC).

d. tidal volume (TV).

e. vital capacity (VC).

The free radicals that inflict oxidative damage on the lungs are generated by all of the following EXCEPT:

a. tobacco smoke.

b. neutrophils.

c. ozone.

d. monocytes.

e. SO2.

Which of the following gases would most likely pass all the way through the respiratory tract and diffuse into the pulmonary blood supply?

a. O3 (ozone).

b. NO2.

c. H2O.

d. CO.

e. SO2.

All of the following statements regarding particle deposition and clearance are true EXCEPT:

a. One of the main modes of particle clearance is via mucociliary escalation.

b. Diffusion is important in the deposition of particles in the bronchial regions.

c. Larger volumes of inspired air increase particle deposition in the airways.

d. Sedimentation results in deposition in the bronchioles.

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