Pseudostratified (false layered) ciliated (possessing cilia) columnar (shaped like a column) epithelium is really a simple epithelium. Stratified means occurring in layers. In this type of epithelium, the nuclei of the cells can be seen at different levels and not all of the cells seem to reach the surface. Each cell, however, attaches to the basement membrane, so there is only one true layer of cells although there appears to be more because the nuclei are found across multiple levels of the cell. Where is this type of tissue found?

Question

Pseudostratified (false layered) ciliated (possessing cilia) columnar (shaped like a column) epithelium is really a simple epithelium. Stratified means occurring in layers. In this type of epithelium, the nuclei of the cells can be seen at different levels and not all of the cells seem to reach the surface. Each cell, however, attaches to the basement membrane, so there is only one true layer of cells although there appears to be more because the nuclei are found across multiple levels of the cell. Where is this type of tissue found?

What is the function of the cilia?

Answer 1

Pseudostratified ciliated columnar epithelium is mainly found in the respiratory tract, specifically in the lining of the trachea, bronchi, and bronchioles.

The function of cilia in this type of tissue is to help move mucus and debris out of the respiratory tract. The coordinated beating of cilia creates a wave-like motion called mucociliary escalator, which helps to propel mucus and trapped particles up and out of the airways. This action helps in the defense against foreign particles, such as dust, bacteria, and viruses, preventing them from reaching the lungs.