Final answer:
The trachea carries air from the nose or mouth to the lungs.
Step-by-step explanation:
The trachea carries air from your nose or mouth to your lungs. It is a tube-like structure made up of cartilage rings, which helps keep it open and prevents it from collapsing. The trachea branches into two smaller tubes called bronchi, which lead to the lungs. From the bronchi, air travels into smaller bronchioles, and finally reaches the alveoli, which are tiny air sacs where oxygen is exchanged for carbon dioxide.