Answer:
The answer to the Question is:
Explanation:
The main ducts and structures of the upper respiratory tract are the nose, nasal cavity, mouth, throat (pharynx) and larynx. The respiratory system is covered by a mucous membrane that secretes mucus, which traps small particles such as pollen or smoke. Hair structures called cilia cover the mucous membrane and displace the particles trapped in the mucus outside the nose. The air that is inhaled is moistened, heated and cleaned by the tissue that lines the nasal cavity.
