It is within the neck and chest
The ciliated epithelium of the tracheobronchial tree helps to remove mucus and foreign particles from the respiratory tract by moving them upwards towards the throat to be either swallowed or expelled. This movement of the cilia helps to protect the lungs from infections and irritants.
The respiratory zone of the tracheobronchial tree includes the respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli where gas exchange occurs. This is where oxygen is absorbed into the bloodstream and carbon dioxide is released from the bloodstream.
Respiratory system has got cilia all over the tracheobronchial tree. This protect the respiratory system from damage.
Tracheobronchial lymph nodes
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Cilia are present all over the bronchial tree. Cilia push the foreign particles out wards. By this way cilia protect your respiratory system from damage by particles. Cilia also push the bacteria out from the respiratory tract.
A patent case involves copyrighted or patented material. The word patent can also mean the subject matter is obvious on its face.
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it is wide open
One type of patent is the design patent, which protects "ornamental characteristics." If the design is sufficiently innovative, it may receive a design patent.
It means it is open and functioning. patent=functional.