What are the free-wandering phagocytic cells that ingest foreign ...

[Haya94]

What are the free-wandering phagocytic cells that ingest foreign material in the respiratory zone of the lungs?
 
  a. Alveolar macrophages
  b. Granular pneumocytes
  c. Type I cells
  d. Type II cells

Question 2

Where are the largest alveoli found in the lung?
 
  a. Lingula
  b. Apexes
  c. Bases
  d. Middle

[katieost]

Answer to Question 1

ANS: A
Macrophages are another common cell found in the alveolar region. They can move from the pulmonary capillary circulation by squeezing through openings in the alveolar septa and then move out onto the alveolar surface. They are defensive cells that patrol the alveolar region and phagocytize foreign particles and cells (e.g., bacteria).

Answer to Question 2

ANS: B
Alveoli found in the apical regions of the vertical lung have greater diameters than those in the basal regions as a result of the gravitational effects. Those in the basal regions are partially col-lapsed as a result of the weight of the organ.