Fourth-Year Medical Students Are Recruited for a Research Study Assessing

Fourth-year medical students are recruited for a research study assessing their ability to interpret biopsy samples obtained during routine clinical practice.  As part of the study, they are given samples of normal respiratory mucosa and asked to identify the cell types present after staining with hematoxylin and eosin.  The students observe that the respiratory epithelium changes in composition as the airways continue distally from the trachea to the alveolar ducts.  Which of the following features is last to disappear?

A) Cartilage
B) Cilia
C) Goblet cells
D) Mucous glands
E) Serous glands

Correct Answer:

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