Question

1. Alveoli of lung are lined by simple squamous epithelium while skin has stratified epithelium. Why?
2. Which substance is present in the adipose tissue? how does it help?

Answer 1

Epithelial cells in the skin are arranged in many layers to prevent wear and tear. So,a type of multilayered epithelium is needed known as stratified squamous epithelium. Whereas Simple squamous epithelium is a single layer of thin and flat cells .The cells are very thin with a delicate lining which fulfill the demand of passing by gas.

Answer 2

Answer:

Alveoli in lungs are the sites of exchange of gases (O² and CO²) for respiration. Hence, they are lined with thin squamous epithelium, which allows diffusion of gases. Skin is the outermost and protective covering of the body. It has stratified compound epithelium at it has high chances of wear and tear.