Gas exchange,the lungs' main and vital function,takes place in the:
A) bronchioles.
B) secondary bronchi.
C) primary bronchi.
D) alveoli.

Question

Quizplus · Accepted Answer

Gas exchange occurs in the alveoli, which are small air sacs in the lungs where oxygen and carbon dioxide are exchanged. The bronchioles and bronchi are part of the airways, but they do not directly participate in gas exchange.

Gas Exchange,the Lungs' Main and Vital Function,takes Place in The