Question

Lung alveoli of mammals have a thin wall composed of

• A. Simple cuboidal epithelium
• B. Simple squamous epithelium
• C. Stratified cuboidal epithelium
• D. Stratified squamous epithelium

Answer 1

The correct option is B

Simple squamous epithelium

The correct option is (B)

Explanation of the correct option:

1. The alveolar walls are lined with simple squamous epithelium cells.
2. The single layer of the squamous epithelium is ideal for the gaseous exchange in the lungs.

Explanation of the incorrect options:

Option (A):

The simple cuboidal epithelium is found on the surface of ovaries, the lining of the nephron, walls of renal tubules, etc.

Option (C):

The stratified cuboidal epithelium is found in excretory ducts of salivary and sweat glands.

Option (D):

The stratified squamous epithelium forms the outer layer of skin.

Final answer: The lung alveoli of mammals have a thin wall composed of simple squamous epithelium.