Physiologists Conduct a Study to Identify the Protein Constituents Present

Physiologists conduct a study to identify the protein constituents present in normal pulmonary secretions.  They recruit 20 healthy men and women who do not take any medications and have no history of tobacco use.  Bronchoalveolar lavage is performed, and the proteins in the fluids are isolated.  A specific protein is found that can degrade the elastin present in the extracellular matrix.  Which of the following cells are most likely producing this protein?

A) Alveolar macrophages
B) Ciliated epithelium
C) Club cells
D) Goblet cells
E) Type I pneumocytes
F) Type II pneumocytes

Correct Answer:

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