Where within the respiratory system does the exchange of gases, or diffusion occur?
a. larynx
b. bronchiles
c. alveoli
d. alveolar sacs
Answer: d. alveolar sacs
The actual exchange of gases within the respiratory system occurs in the Alveolar sacs. These are the smallest structure within the lungs, and it is here that the exchange of oxygen and carbon dioxide occurs, passing these gasses into or out of the bloodstream.