Which passageway allows air to pass to and from the lungs?

Which passageway allows air to pass to and from the lungs?

• A. Nose
• B. Bronchi
• C. Esophagus
• D. Trachea

Answer: (D)

Airways that carry air down to the lungs are designed to conduct air efficiently while protecting the lungs. The trachea is the main conduit in the lower respiratory tract that connects the larynx to the bronchi, directing air into the lungs and back out. Air may enter the body through the nose or mouth, but it travels down the pharynx and larynx into the trachea, which then splits into the right and left bronchi and continues to smaller airways until reaching the alveoli. The trachea is structured with cartilage to stay open and a ciliated, mucus-lined lining to trap and move particles out of the airway. The nose and other structures filter and humidify air, but the direct passage to the lungs is the trachea. The esophagus, by contrast, handles food and is not involved in air passage.

Airways that carry air down to the lungs are designed to conduct air efficiently while protecting the lungs. The trachea is the main conduit in the lower respiratory tract that connects the larynx to the bronchi, directing air into the lungs and back out. Air may enter the body through the nose or mouth, but it travels down the pharynx and larynx into the trachea, which then splits into the right and left bronchi and continues to smaller airways until reaching the alveoli. The trachea is structured with cartilage to stay open and a ciliated, mucus-lined lining to trap and move particles out of the airway. The nose and other structures filter and humidify air, but the direct passage to the lungs is the trachea. The esophagus, by contrast, handles food and is not involved in air passage.