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 ...

The trachea, or windpipe, is a flexible tube made of cartilage rings that meet at a thin muscle called the trachealis muscle. The trachea collapses because the dog’s cartilage rings are ...