O₂ moves from the alveoli to the blood by active transport.

Question

Quizplus · Accepted Answer

Oxygen moves from the alveoli to the blood by diffusion, not active transport. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration, and as the concentration of oxygen is higher in the alveoli than in the blood, oxygen moves by diffusion. Active transport, on the other hand, requires the use of energy to move molecules against their concentration gradient, which is not the case for oxygen moving from the alveoli to the blood.

O₂ Moves from the Alveoli to the Blood by Active