Q: Where does gaseous exchange occur in the respiratory system?  

Answer: B

Gaseous exchange occurs in the respiratory tree, which is also known as the exchange zone. It includes respiratory bronchioles, alveolar ducts, atria, alveolar sacs, and alveoli. During the process of respiration, oxygen diffuses from the alveoli into the capillaries and carbon dioxide diffuses from the capillaries into the alveoli to be exhaled. The respiratory tree is specialized for gas exchange due to the large surface area of the alveoli and the thin walls of the alveolar sacs, which allow for efficient diffusion of gases.

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