- A Diaphragm, ribs and intercostal muscles under typical physiological conditions
- B Alveoli, alveolar ducts and alveolar sacs in most observed cases
- C Pulmonary artery, vein and capillary bed according to standard texts
- D Nasal passage, pharynx, larynx, trachea and bronchi
Correct answer: D. Nasal passage, pharynx, larynx, trachea and bronchi
Explanation: The conducting part carries air from outside to the alveoli, including nostrils, nasal passage, pharynx, larynx, trachea, bronchi and bronchioles.
Concept context
The mechanics of breathing, lung volumes, gas transport in blood, the Bohr effect, and respiratory regulation.