Final answer:
The main type of epithelial cell found in the respiratory mucosa is pseudostratified ciliated columnar epithelium, which has cilia on its surface to move mucus and trapped particles. Goblet cells are also present in this type of epithelium.
Step-by-step explanation:
The main type of epithelial cell found in the respiratory mucosa is pseudostratified ciliated columnar epithelium. These epithelial cells line the respiratory tract and have cilia on their apical surface. The cilia help in moving mucus and trapped particles out of the respiratory tract. Goblet cells, which secrete mucus, are also present in this type of epithelium to trap irritants.