why does the trachea have cilia
The cilia in the trachea move in a rhythmatic motion and the mucus produced by gland cells which traps foreign unwanted particles, like bacteria etc, is moved up to the pharyn â¦ x where it is either coughed out or swallowed.3 people found this useful.ome cells in this lining secrete a sticky liquid called mucus, which traps particles of dirt or bacteria that are breathed in. Other cells are covered with timy hair-like str â¦ uctures called cilia. It sweeps the mucus and trapped particles out toward the mouth.