Question

part a the wall of the alveolus (air sac) in the lung is composed of which type of epithelium? view available hint(s) simple squamous epithelium transitional epithelium simple columnar epithelium

Explanation:

The alveolar wall in the lung needs a thin epithelium for gas exchange. Simple squamous epithelium is a single layer of flat cells, ideal for diffusion (like in alveoli). Transitional epithelium is for stretch (e.g., bladder), and simple columnar is for absorption/secretion (e.g., intestines), so they don't fit alveolar function.

Answer:

A. simple squamous epithelium