What type of epithelial cells are primarily found in alveoli?

• A. Simple cuboidal
• B. Pseudostratified ciliated columnar
• C. Simple squamous
• D. Stratified squamous

Answer: (C)

The type of epithelial cells primarily found in alveoli is simple squamous epithelium. This particular tissue is composed of a single layer of flat cells, which is crucial for the function of the alveoli in gas exchange. The thinness of simple squamous cells allows for maximum surface area and minimal barrier for diffusion, enabling efficient transfer of oxygen and carbon dioxide between the air in the alveoli and the blood in the surrounding capillaries.

In the alveoli, these cells play a critical role in ensuring that gases can efficiently diffuse due to their minimal thickness, which is essential for respiratory function. The presence of a single layer of flat cells also helps in reducing the distance that gases must travel during this exchange process, contributing to optimal respiratory efficiency. In contrast, other types of epithelial cells like cuboidal, pseudostratified, or stratified squamous are not suited for the specific demands of gas exchange in the alveoli.