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 the capillaries than the alveoli. E) an equal concentration of O₂ in the alveoli and the capillaries.

Question

Quizplus · Accepted Answer

Oxygen (O2) diffuses into the capillaries of the lungs from the alveoli because there is a higher concentration of O2 in the alveoli than the capillaries. This concentration gradient drives the diffusion of O2 from the alveoli into the capillaries, where it can be transported to the rest of the body.

Oxygen Diffuses into the Capillaries of the Lungs Because There