How does the trchea stay open?

The trachea stays open due to the presence of C-shaped cartilage rings that provide structural support. These rings prevent the trachea from collapsing, allowing it to remain patent (open) during breathing. Additionally, the trachea is lined with a mucous membrane that helps to keep it moist and aids in trapping particles, further supporting its function as an airway. The flexibility of the trachea, due to its incomplete cartilage rings, allows it to adjust during swallowing and other movements.