Question

select all that apply
choose all places you find simple squamous epithelium.
lining of lumen of ureters
lining of upper respiratory tract
lining of air sacs (alveoli) of lungs
lining of lumen of blood vessels (endothelium)

Explanation:

Simple squamous epithelium is a single - layer of flat cells. It is found in areas where diffusion and filtration occur. The lining of the air sacs (alveoli) of lungs is for gas exchange (diffusion of oxygen and carbon - dioxide), and the lining of the lumen of blood vessels (endothelium) is for the exchange of substances between blood and tissues. The lining of the lumen of ureters is transitional epithelium to allow for stretching, and the lining of the upper respiratory tract is mainly pseudostratified ciliated columnar epithelium for protection and mucus movement.

Answer:

C. lining of air sacs (alveoli) of lungs, D. lining of lumen of blood vessels (endothelium)