Question

what type of tissue forms the walls of the alveoli?
multiple choice
ciliated columnar epithelium
simple squamous epithelium
stratified squamous epithelium
areolar connective tissue

Explanation:

Alveoli are tiny air sacs in the lungs. Simple squamous epithelium is thin, which allows for efficient gas exchange (oxygen and carbon dioxide) across the alveolar walls. Ciliated columnar epithelium is more about moving substances (like mucus in the respiratory tract's upper parts), stratified squamous epithelium is for protection (e.g., skin), and areolar connective tissue is a more general connective tissue (not forming the alveolar walls' main tissue).

Answer:

Simple squamous epithelium.