Question: what are the two types of cells found in the lungs alveoli sacs?
Answer: The alveolar epithelial cells (pneumocytes) line the alveolar compartment of the lungs. There exist two types of alveolar cells: type I (the prevailing type) and type II alveolar cells. Type I alveolar cells are squamous extremely thin cells involved in the process of gas exchange between the alveoli and blood.