Air enters the nasal cavity of the respiratory system through the nostril . The nasal cavityis divided by the midline nasal septum Thenasal cavity mucosa has several functions. Its major functions are to warm, moist and clean the incoming air.
The nasal cavity and the mouth meet at the pharynx, or throat, at the back of the nose and mouth. From there, air quickly enters the second part of your respiratory system, the trachea or windpipe. The trachea is a tube that delivers air to the lungs, the third and most important part of your respiratory system.
