Cytoplasmic extensions of their type I cells form their epithelium, which separates them from the capillary endothelium and allows their primary function.
These microstructures are normally guarded from damage from neutrophil elastase buildup by the protein alpha-1 antitrypsin. Adhesive atelectasis is caused by underproduction of surfactant by their * Type II cells. Cytoplasmic extensions of their type I cells form their epithelium, which separates them from the capillary endothelium and allows their primary function. The termination point for bronchioles, FTP, name these small cup-shaped sacs of the lungs, the site of diffusion of oxygen into the bloodstream.
These microstructures are normally guarded from damage from neutrophil elastase buildup by the protein alpha-1 antitrypsin.
alveoli (prompt on "lungs" before *)