Gas exchange in the lungs occurs
A)across approximately 300 million alveoli.
B)in the conducting zone.
C)in the respiratory zone.
D)both A and C are correct answers

Question

Quizplus · Accepted Answer

Gas exchange occurs in the respiratory zone, which includes the alveoli. There are approximately 300 million alveoli in the lungs. Therefore, options A and C are both correct. The conducting zone is responsible for transporting air to and from the respiratory zone and does not participate in gas exchange.

Gas Exchange in the Lungs Occurs