Which type of epithelium forms the alveoli in the lungs?

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

Answer: (C)

Verified step by step guidance

1. Understand the function of alveoli: Alveoli are tiny air sacs in the lungs where gas exchange occurs. They need to be thin to allow for efficient diffusion of oxygen and carbon dioxide.
2. Identify the characteristics of different epithelial types: Transitional epithelium is found in the urinary bladder and allows for stretching. Stratified squamous epithelium is protective and found in areas subject to abrasion, like the skin. Simple cuboidal epithelium is involved in secretion and absorption, found in glands and kidney tubules.
3. Recognize the structure of simple squamous epithelium: It consists of a single layer of flat cells, which is ideal for diffusion and filtration processes.
4. Relate the structure to function: The thinness of simple squamous epithelium facilitates the rapid exchange of gases in the alveoli, making it the most suitable type for this location.
5. Conclude that the simple squamous epithelium is the type that forms the alveoli in the lungs, due to its structural and functional properties that support efficient gas exchange.