What is the FUNCTION of cilliated epithelium (the cilia) in the lining of the trachea and bronchi?

The ciliated epithelium in the lining of the trachea and bronchi serves several important functions:

1. Movement of Mucus: The primary function of the cilia is to move mucus. The cilia beat in a coordinated fashion, creating a wave-like motion that moves mucus (which traps dust and other foreign particles) upwards and out of the respiratory tract. This is often referred to as the "mucociliary escalator."

2. Protection: By moving mucus out of the respiratory tract, the cilia help to protect the lungs from infection and damage. The mucus traps bacteria, viruses, and other harmful particles, preventing them from reaching the lungs.

3. Moisture and Temperature Regulation: The ciliated epithelium also helps to regulate moisture and temperature within the respiratory tract. This is important for maintaining the health and function of the lungs.

In summary, the ciliated epithelium in the trachea and bronchi plays a crucial role in maintaining respiratory health by moving mucus, protecting the lungs, and regulating moisture and temperature.