Tracheal collapse occurs when the windpipe becomes flattened and the airflow in and out of the lungs is obstructed. The rings of cartilage that support the windpipe lose their strength and become ...

The air that enters the nasal cavity flows down the trachea. The trachea has a number of adaptations: cartilage rings in the walls of the trachea help to keep it open ciliated epithelium and ...