The actual sites of gas exchange within the lungs are
A)bronchioles.
B)terminal bronchioles.
C)pleural spaces.
D)alveoli.
E)interlobular septa.

Question

Quizplus · Accepted Answer

Gas exchange occurs within the alveoli, which are small, thin-walled sacs at the end of the bronchioles. Oxygen diffuses across the alveolar membrane and into the bloodstream, while carbon dioxide diffuses from the bloodstream into the alveoli to be exhaled. The bronchioles, terminal bronchioles, pleural spaces, and interlobular septa are all important structures within the lungs, but are not the main sites of gas exchange.

The Actual Sites of Gas Exchange Within the Lungs Are