What is the name of the tube that carries air into the lungs?

The tube that carries air into the lungs is called the trachea. It serves as the main airway and is a crucial passage that connects the larynx (voice box) to the bronchi, which leads to the lungs. The trachea is lined with cilia and mucus, which help to trap and expel foreign particles and pathogens, ensuring that the air entering the lungs is clean and free of harmful substances.

The bronchi are the two main branches of the trachea that lead directly into the lungs, but they do not carry air on their own until it has passed through the trachea. The esophagus, on the other hand, is the tube that carries food and liquids to the stomach and does not play a role in air transport. Alveoli are the tiny air sacs in the lungs where gas exchange occurs, but again, they do not carry air themselves; rather, they facilitate the exchange of oxygen and carbon dioxide. Thus, the trachea is specifically designated for transporting air into the lungs, making it the correct answer.