Where does gas exchange occur within the lungs?
A) alveoli
B) secondary bronchi
C) bronchioles
D) None of the listed responses is correct.

Question

Quizplus · Accepted Answer

Gas exchange occurs within the alveoli, which are tiny sacs located at the end of the bronchioles in the lungs. Oxygen from inhaled air diffuses into the bloodstream through the walls of the alveoli, while carbon dioxide, a waste product of cellular respiration, diffuses out of the bloodstream and into the alveoli to be exhaled. Secondary bronchi and bronchioles are airways that lead to the alveoli but do not participate in gas exchange themselves.

Where Does Gas Exchange Occur Within the Lungs