Mucus Hypersecretion in Chronic Obstructive Pulmonary Disease and Its Treatment

Figure 1

Model of airway mucus epithelium: goblet cells and submucosal glands secret mucin, which forms mucus on the surface of the airway. It contains an upper gel layer and lower sol layer, between which is a surfactant layer present which helps in lubrication and transfer of energy from beating cilia to propel out inhaled pathogens and particles by the process known as mucociliary clearance.