Secretions from the highlighted glands secretions from the highlighted glands produce a layer of enzyme laden mucus that captures dirt and destroys inhaled bacteria supply nutrients to the underlying cartilage tissue produce sebum that lubricates the epithelial tissue lining the lumen produce secretions that contribute to the fluid matrix of hyaline cartilage

Answer;

produce a layer of enzyme laden mucus that captures dirt and destroys inhaled bacteria

Explanation;Secretions from the highlighted glands produce a layer of enzyme laden mucus that captures dirt and destroys inhaled bacteria During inhalation airt that contains dust particles or bacteria or other microorganisms may enter the air ways. The layer of the airway covering the airways, is rich in antimicrobial compounds and mucins that are responsible for removal bacteria and other microorganisms from the airway .This layer consist of mucus that traps, kills, and also inactivates the bacteria. It also contains periciliary fluid which keeps mucus at optimum distance from the underlying epithelia, to enhance bacteria clearance and  the motility of cilia.