Q: Which part of the lungs is responsible for gaseous exchange in humans?  

Answer: C

The lungs are divided into two regions: the conducting zone and the respiratory zone. The conducting zone consists of the trachea, bronchi, and bronchioles and is responsible for air transport. The respiratory zone is where gas exchange occurs, and it includes the respiratory bronchioles, alveolar ducts, and alveoli. Gaseous exchange takes place in the respiratory region, specifically in the alveolar ducts and alveoli. These structures are surrounded by a network of capillaries where oxygen from the air is exchanged for carbon dioxide from the blood. Thus, option C is the correct answer.

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