Final answer:
Pseudostratified epithelium is a tissue that lines the respiratory tract and appears stratified due to the arrangement of nuclei. It contains goblet cells and cilia, which aid in trapping and removing particles and mucus from the respiratory tract.
Step-by-step explanation:
Pseudostratified epithelium is a type of tissue that lines the respiratory tract. It appears stratified because the nuclei of the cells are at different levels, giving the illusion of multiple layers. However, it is actually a single layer of cells attached to the base membrane. This cellular covering contains goblet cells, which secrete mucus into the respiratory tract, and cilia at the apical surface of the cells. These cilia help move the mucus and trapped particles out of the respiratory tract, protecting it from harmful substances.