Which structures carry air into the lungs?

The bronchi and bronchiole tubes are the correct structures that carry air into the lungs. When air inhaled through the nasal cavity is warmed and filtered, it enters the pharynx, then travels down the trachea. The trachea subsequently divides into the right and left main bronchi, which further branch into smaller bronchi and then into bronchioles. This branching pattern ensures that air reaches all parts of the lungs where gas exchange can occur.

Alveoli, while critical for the exchange of oxygen and carbon dioxide, do not carry air into the lungs; they are the tiny air sacs at the ends of bronchioles where this gas exchange takes place. Sinuses are air-filled spaces within the bones of the skull, which help to warm and moisturize air but do not have a direct role in transporting air to the lungs. The pharynx serves as a pathway for air to enter the trachea but does not carry air directly into the lungs like the bronchi and bronchioles do.