It traps bacteria and dust.
no
Trachea's inner lining(lining that faces the hollow side) is comprised of ciliated epithelium which rests on a basement membrane made of protein fibers. In between the ciliates cells the goblet cells are situated. Beneath the epithelium is an area of loos tissue and tracheal glands that secrets mucus (both tracheal glands and goblet cells secrets mucus so don't get confused which one produces mucus). There is a C-Shaped cartilage in outer lining that supports the trachea.
Ciliated epithelium is located in the lining of most body cavities. Some of the cavities that have ciliated epithelium are the lungs, trachea, and nose. Ciliated epithelium serves to keep dust and debris out of the lungs and control the flow of mucus.
The stomach has a lining of protective mucus.
Mucus and cilia. The dirt and other impurities that enter the respiratory tract are trapped by the mucus, in order not to enter the lungs and its structures. But the accumulation of too much mucus in the trachea would impede us from breathing, so the cilia sweep the mucus out of the trachea.
The cilia are always moving, bacteria or particles of dust trapped in the mucus are moved away by cilia. The cilia waft the mucus containing bacteria and dust up to the back of the throat, so that it doesn't block up the trachea and thus keeps it clean.
mucus!!!!!!mucus trap the dirt in the trachea!
Trachea
lining the what?
Helps expell mucus from trachea
Mucus protects stomach lining from gastric acids.
Mucus is a substance produced by the lining of the nasal cavity. This mucus helps moisten and filter incoming air.