Oxygen diffuses into the capillaries of the lungs because there is A)a higher concentration of O₂ in the alveoli than the capillaries. B)a higher concentration of O₂ in the capillaries than the alveoli. C)a higher concentration of CO₂ in the alveoli than the capillaries. D)a higher concentration of CO₂ in capillaries than the alveoli. E)an equal concentration of O₂ in the alveoli and the capillaries.

Question

Quizplus · Accepted Answer

Oxygen diffuses from an area of higher concentration (in the alveoli) to an area of lower concentration (in the capillaries). Therefore, there is a higher concentration of oxygen in the alveoli compared to the capillaries, causing it to diffuse into the capillaries.

Oxygen Diffuses into the Capillaries of the Lungs Because There