Final answer:
The trachea's mucosa is lined with epithelial tissue, providing protection and aiding in respiratory functions.
Step-by-step explanation:
The mucosa lining the trachea is composed of epithelial tissue, specifically pseudostratified ciliated columnar epithelium. This type of epithelium includes goblet cells that secrete mucus, trapping particles and aiding in their removal from the airway. This arrangement serves as a protective barrier while maintaining the trachea's function in air conduction.