Which of the following provide the greatest surface area for gas exchange?
A) alveolar sacs
B) alveoli
C) respiratory bronchioles
D) alveolar ducts

Question

Quizplus · Accepted Answer

Alveoli have thin walls and a large surface area, making them the primary site for gas exchange in the lungs. Alveolar sacs, respiratory bronchioles, and alveolar ducts all connect to the alveoli and contribute to gas exchange, but they do not provide as much surface area as the alveoli themselves.

Which of the Following Provide the Greatest Surface Area for Gas