Which type has cilia that beat in waves to move debris and mucus?

• A. Ciliated epithelium
• B. Simple cuboidal epithelium
• C. Columnar epithelium
• D. Compound epithelium

Answer: (A)

The main idea is how certain epithelial cells use tiny hair-like structures to move mucus and debris out of the airways. Ciliated epithelium has cilia on its surface that beat in coordinated waves, creating a mucus current that pushes dust, microbes, and other particles up and out of the respiratory tract. This mucociliary movement helps keep the airways clear and protects the lungs from infection and irritation. That’s why this type is the best answer.

Other options describe tissues by shape or layering rather than by this specialized feature. Simple cuboidal epithelium is cube-shaped and generally lacks cilia, focusing on absorption and secretion. Columnar epithelium refers to tall cells and can be non-ciliated or ciliated depending on the context, but the term alone isn’t specific to the ciliary movement. Compound epithelium is multi-layered and mainly provides protection, not coordinated ciliary movement.