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
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).
You might also like to view...
A 16-year-old girl had an asymptomatic 2 x 3 cm crepitant mass in her tongue. It was slightly lighter in color than the surrounding tissue. Biopsy showed numerous endothelial-lined channels. This is a:
a. Granular cell tumor b. Ranula c. Mucocele d. Lymphangioma e. Lymphoma
Which of the following represents the correct sequence for the rise and fall of myoglobin, CK-MB, and cTnI after an AMI?
A. CK-MB, cTnI, myoglobin B. cTnI, CK-MB, myoglobin C. Myoglobin, CK-MB, cTnI D. CK-MB, myoglobin, cTnI