How does mucus help keep the airway clear?

Mucus plays a crucial role in keeping the airway clear by trapping inhaled particles, such as dust, pollen, and pathogens. This sticky secretion, produced by goblet cells in the respiratory tract, helps to coat and protect the airway lining. Additionally, cilia—tiny hair-like structures on the surface of airway cells—move in a coordinated manner to transport the mucus, along with trapped particles, upward toward the throat, where it can be swallowed or expelled. This mechanism helps to maintain clear airways and prevent respiratory infections.