Question

Which type of epithelial tissue lines the inner surface of the trachea?

• A. Squamous
• B. Cuboidal
• C. Hyaline cartilage
• D. Pseudostratified ciliated columnar

Answer 1

The correct option is D

Pseudostratified ciliated columnar

The correct option is D:

Explanation of correct option:

1. Epithelial tissue's main function is to cover the body's surface and protect it.
2. It can also form the glands and ducts for absorption, secretion, lubrication, and excretion purpose.
3. Epithelial tissues can be flat (squamous i.e., scale-like tissue), tall (columnar shaped), or cube-shaped (cuboidal).
4. In the inner surface of the trachea and the upper respiratory tract, the cells seem to be stratified.
5. As they are tightly packed and positioned their nuclei are in the compelled way to give it stratified appearance to tissue.
6. So, they are named Pseudostratified ciliated columnar.
7. This epithelium i.e., Pseudostratified ciliated columnar tissue includes the cells to trap the dirt debris and pathogens that can damage the breathing system.

Explanation of incorrect option:

Option A:

1. Squamous epithelial cells are flattened and round and they have an irregular border.
2. Their function is to filter the substances across the tissues i.e. they allow the filtration and diffusion.
3. They are located in the lung sacs, in the lining of the heart, and blood and lymphatic vessels.

Option B:

1. Cuboidal epithelial cells are cubed-shaped and tall tissues.
2. They allow the absorption and secretion
3. They are found in the secretory ducts of small glands and kidney tubules.

Option C:

1. Hyaline cartilage is a connective tissue that contains a collage that is also present in bones, and skins, and it helps to hold the body together.

Final Answer: Thus, Pseudostratified ciliated columnar epithelial tissue lines the inner surface of the trachea.