its movements aid the ventilation of the lungs
The mucus helps to clean the inhaled air by trapping dust and other particles on its sticky surface. The incoming air is also warmed as it passes through the nasal cavity.
entering the Prevents choking caused by food trachea. passes Vibrate to produce sound when exhaled air over them. The cartilage prevents the trachea collapsing when the air pressure inside it is lowered during inspiration. The goblet cells produce the mucus that traps particles from inhaled air, while the cilia move the mucus laden with dirt and microorganisms up to the throat, where it passes into the stomach, via