Table 1.

Pulmonary cells and their function.

CELL	PUTATIVE FUNCTION
Ciliated columnar	Mucus movement
Mucus (goblet)	Mucus secretion
Serous	Periciliary fluid
Clara (nonciliated epithelial)	Surfactant production, metabolism
Brush	Transitional form of ciliated epithelial cell
Basal	Progenitor for ciliated epithelial cell and goblet cell
Dendritic cells	Antigen Presenting Cell
Neuroendocrine	Chemoreceptor, paracrine function
Alveolar Type I	Alveolar gas exchange
Alveolar Type II	Surfactant secretion, differentiation to type I cell
Alveolar Macrophages	Pulmonary defense
Mast	Immunoregulation