Basic and Clinical Sciences (BCSE) Practice Exam

Which type of epithelium is found in terminal bronchioles?

1. Ciliated cuboidal epithelium

2. Simple cuboidal epithelium

3. Simple squamous epithelium

4. Stratified squamous epithelium

The correct answer is: Ciliated cuboidal epithelium

Terminal bronchioles are the smallest conducting airways leading to the respiratory bronchioles and ultimately to the alveoli where gas exchange occurs. In these regions, the type of epithelium present plays a significant role in both airway function and mucociliary clearance. Ciliated cuboidal epithelium is indeed the correct type of epithelium found in terminal bronchioles. This epithelium consists of cells that are cuboidal in shape and feature cilia on their apical surface. The presence of cilia is crucial for moving mucus and trapped debris out of the airways, thereby helping to keep the respiratory passages clear and free from pathogens. The cuboidal shape allows for a balance between surface area and the thickness of the epithelium needed to protect the underlying tissues while providing some secretory functions. The other types of epithelium listed do not correctly describe the lining of terminal bronchioles. For example, simple cuboidal epithelium lacks cilia, which are important for the clearance of mucus. Simple squamous epithelium is typically found in areas where diffusion occurs, such as the alveoli, not in conducting airways. Lastly, stratified squamous epithelium