Final answer:
The lining of the alveoli is responsible for gas exchange between the lungs and blood. Alveoli are tiny air sacs in the lungs where oxygen from the inhaled air enters the bloodstream and carbon dioxide from the bloodstream is exhaled. The correct option is b.
Step-by-step explanation:
The lining of the alveoli is responsible for gas exchange between the lungs and blood.
Alveoli are tiny air sacs in the lungs where oxygen from the inhaled air enters the bloodstream and carbon dioxide from the bloodstream is exhaled.
The alveoli are surrounded by capillaries, which are small blood vessels. Oxygen and carbon dioxide are exchanged across the thin walls of the alveoli and capillaries through a process called diffusion.