Page 689 - Atlas of Histology with Functional Correlations

3. What is the main function of surfactant?

A. To reduce air flow into the lung

B. To increase air flow into the lung

C. To reduce alveolar surface tension

D. To reduce the alveolar lumina

E. To decrease the blood–air barrier

4. Which cells serve as stem cells for renewing the olfactory epithelium?

A. Goblet cells

B. Sustentacular cells

C. Ciliated cells

D. Basal cells

E. Connective tissue cells

5. The serous secretory substance in which odorant molecules dissolve is
produced by:

A. olfactory (Bowman) glands.

B. olfactory vesicles.

C. goblet cells.

D. olfactory cilia.

E. basal cells.

ANSWERS

1. Correct Answer: C. Type II alveolar cells. These cells not only produce
surfactant material but also can serve as stem cells for replacing type I
alveolar cells during lung injury.

2. Correct Answer: B. Type II alveolar cells. These cells synthesize and

release the tension-reducing substance surfactant for alveoli.

3. Correct Answer: C. To reduce alveolar surface tension. This allows for
easier alveolar expansion and prevention of alveolar collapse during
respiration.

4. Correct Answer: D. Basal cells. These cells give rise to olfactory and
supportive cells of the olfactory epithelium.

688