Question

Inner surface of the bronchi, bronchioles and fallopian tubes are lined by

• A. Cubical epithelium
• B. Columnar epithelium
• C. Squamous epithelium
• D. Ciliated epithelium

Answer 1

Answer: (D)

Ciliated epithelium

Ciliated columnar epithelium is characterized by presence of columnar cells covered with cilia and scattered mucus secreting goblet cells. The mucus serves to trap the foreign particles while the cilia are responsible for movement of mucus and sex cells. Therefore, linings of lower respiratory tract (bronchi and bronchioles) and fallopian tube have ciliated epithelium. This makes option D correct.

Option B is incorrect as only ciliated columnar epithelium with goblet cells lines the respiratory tract and fallopian tubes. Cuboidal epithelium consists of a single layer of cube-shaped cells and serves in secretion (in glands) and absorption (in kidney tubules) mainly. This makes option A incorrect.

Squamous epithelium consists of flattened cells which are specialized to perform the functions of filtration, diffusion and osmosis and therefore, are found in linings of air sacs of lungs, blood vessels and heart. This makes option C incorrect.

Therefore, the correct answer is option D.