Trachea

• Ciliated epithelium tissue lines the trachea, bronchi, and bronchioles; the ciliated and goblet cells keep the lungs clear of dust and pathogens
• Goblet cells secrete mucus into the airways’ lumen, which traps pathogens, pollen or dust from air breathed in; then cilia move coordinatedly to waft mucus to the top of the trachea, where it’s swallowed and destroyed in the stomach