What happened to air when it gets inside the trachea?

When air enters the trachea, it is directed towards the lungs through a tube that is reinforced with cartilage to keep it open. The air is warmed, moistened, and filtered as it passes through the trachea, which is lined with ciliated mucous membranes that trap debris and pathogens. This process prepares the air for its journey into the bronchi and ultimately the alveoli, where gas exchange occurs.