Mucociliary clearance apparatus (MCC)

The mucociliary clearance apparatus is the primary mechanical defense of the lung, composed of airway epithelial cilia, mucus secreted by goblet and submucosal cells, and the airway surface liquid. Ciliary beating transports the mucus layer containing trapped particles and pathogens upwards toward the pharynx for elimination. When mucus accumulates or thickens, cough and airflow assist clearance. Dysfunction of any component impairs mucus transport, leading to airway obstruction, increased infection risk, and chronic lung disease. Therapies target mucus hydration, viscosity, and ciliary function to facilitate “phlegm resolution”—the restoration of airway patency by removal of excess or abnormal mucus.

Other names

mucociliary escalatorairway clearancemucus clearancemucus transportmucociliary transport

Mucolytics reduce mucus viscosity and promote clearance. Hydrators increase airway surface liquid hydration. Bronchodilators improve airway patency. Mechanical physiotherapy enhances airflow/shear for clearance.