The main site of gas exchange is the ________.
A) alveolar duct
B) respiratory bronchiole
C) alveoli
D) alveolar sacs

Question

Quizplus · Accepted Answer

The alveoli are the primary site of gas exchange in the respiratory system. Oxygen diffuses from the alveoli into the pulmonary capillaries to be transported to the rest of the body, while carbon dioxide diffuses from the capillaries into the alveoli to be exhaled. The alveoli are small sacs located at the end of the respiratory bronchioles and within the alveolar sacs. The alveolar ducts connect the respiratory bronchioles to the alveolar sacs, but are not the primary site of gas exchange.

The Main Site of Gas Exchange Is the ________