What is the large tube connecting the larynx to the bronchial tubes that moves air to and from the lungs?

• A. Trachea
• B. Esophagus
• C. Bronchus
• D. Alveolus

Answer: (A)

This question is about the airway that conducts air from the larynx down into the lungs. The large tube that fits this description is the trachea, or windpipe. It runs from the larynx and divides into the main bronchi that lead to each lung, keeping air moving in and out. Its walls have cartilage rings that keep it open during breathing, and its inner lining is a ciliated epithelium with goblet cells that help trap and clear mucus and particles. The esophagus, by contrast, is the posterior tube that carries food to the stomach; the bronchus is a branch that splits from the trachea to each lung, not the main passage; and the alveolus is a tiny air sac where gas exchange occurs, not a tube.