What drives the movement of oxygen from the alveoli into the bloodstream?
A) active transport against a concentration gradient
B) facilitated diffusion down a concentration gradient
C) facilitated diffusion against a concentration gradient
D) diffusion down a concentration gradient
E) the heart pumping the oxygen into the bloodstream

Question

Quizplus · Accepted Answer

Oxygen naturally moves from the airspace in the lungs, where it is in high concentration, to the deoxygenated blood in the lungs, where it is in low concentration.

What Drives the Movement of Oxygen from the Alveoli into the Bloodstream