Pseudostratified columnar epithelium is found in which locations?

• A. Lining of the nasal cavity, trachea, and bronchi
• B. Lining of the stomach, intestines, gallbladder, and uterine tubes
• C. Outer layer of skin
• D. Kidney tubules

Answer: (A)

Pseudostratified columnar epithelium is structured as a single layer of tall cells that vary in height, so their nuclei sit at different levels and give a false layered look. This tissue often has cilia and goblet cells, which work together to trap and move mucus out of the airways. That setup is ideal for the respiratory tract, where sweeping mucus helps keep the airways clear of debris. So the lining of the nasal cavity, trachea, and bronchi is the classic location for this tissue.

In contrast, the stomach, intestines, gallbladder, and uterine tubes are lined mainly by simple columnar epithelium (great for absorption and secretion). The outer skin layer is stratified squamous epithelium (for protection), and kidney tubules use simple cuboidal epithelium (for secretion and absorption).