Question

Simple squamous epithelium is found in

• A. Skin
• B. Alveoli of lungs
• C. Tendon
• D. Brain

Hint:

Simple squamous epithelium is found where diffusion or filtration occurs, such as alveoli and capillaries.

Answer 1

The Correct Option is B

Concept:
Simple squamous epithelium is a single layer of thin, flat cells. It is suitable for diffusion, filtration, and exchange of gases.

Step 1: Understanding simple squamous epithelium.
The cells are very thin and flattened. This reduces the distance across which substances have to diffuse.

Step 2: Function in lungs.
The alveoli of lungs are sites of gaseous exchange. Oxygen diffuses from alveoli into blood, and carbon dioxide diffuses from blood into alveoli. \[ O_2 \leftrightarrow CO_2 \]

Step 3: Why alveoli need thin epithelium.
For rapid gas exchange, the lining must be very thin. Hence, alveoli are lined by simple squamous epithelium.

Step 4: Checking other options.
Skin has stratified squamous epithelium.
Tendon is connective tissue.
Brain is nervous tissue.
Therefore, the correct answer is alveoli of lungs. \[ \boxed{\text{Alveoli of lungs}} \]