PATHOLOGY

Detailed explanation-1: -The endoderm lining the laryngotracheal tube gives rise to the epithelium and glands of the larynx and trachea. Cilia develop in tracheal epithelial cells approximately 2 days later than in the nasal cavity, and secretory cells appear on days 19–20.

Detailed explanation-2: -The mucus traps smaller particles like pollen or smoke. Hairlike structures called cilia line the mucous membrane and move the particles trapped in the mucus out of the nose. Inhaled air is moistened, warmed, and cleansed by the tissue that lines the nasal cavity.

Detailed explanation-3: -The respiratory system includes the nose, mouth, throat, voice box, windpipe, and lungs.