- Type I Pneumocytes: Flat cells that form the majority of the alveolar surface and facilitate gas exchange. - Type II Pneumocytes: Cuboidal cells that secrete surfactant, a substance that reduces surface tension in the alveoli. - Alveolar Macrophages: Immune cells that ingest and remove debris and pathogens from the alveoli. - Ciliated Epithelial Cells: Found in the bronchi and bronchioles, these cells have hair-like structures (cilia) that help move mucus and trapped particles out of the lungs. - Goblet Cells: Produce mucus to trap particles and pathogens.
