The trachea has a number of adaptations: cartilage rings in the walls of the trachea help to keep it open ciliated epithelium and goblet cells to clean ... enters the two bronchi, one bronchus ...

Airway epithelial cells act as a physical barrier against environmental toxins and injury, and modulate inflammation and the immune response. As such, maintenance of their integrity is critical.

Red blood cells and epithelial cells should be enumerated but are not included in the total white cell count. Differential cell counts are most frequently determined on slides prepared either by ...