Question

Gas exchange of CO2 for oxygen occurs between capillaries and what structure in the lungs? A. Veins B. Alveoli C. Bronchioles D. Cilia

Answer 1

B: Alveoli.

Step-by-step explanation:

Answer 2

The correct option is B: Alveoli. Gas exchange of "carbon dioxide and oxygen" takes place in the "alveoli" of the lungs.

Step-by-step explanation:

• Alveoli are present in the alveolar sacs located at the end of respiratory bronchioles. Alveoli have thin walls and look like bubbles in the sacs.

• These also are in "direct contact" with the blood capillaries. This contact ensures that "oxygen" is released into the blood capillaries by the alveoli directly.