Oxygen and carbon dioxide are exchanged:
A) In the upper airway
B) In lung tissue
C) At the alveoli
D) In the lower airway

Question

Quizplus · Accepted Answer

Oxygen and carbon dioxide are exchanged at the alveoli, which are located in the lungs. The alveoli are tiny air sacs where oxygen from inhaled air diffuses into the bloodstream, and carbon dioxide from the bloodstream diffuses into exhaled air to be expelled from the body.

Oxygen and Carbon Dioxide Are Exchanged