Which of the following processes causes most of the carbon dioxide from the blood to move into the alveoli?
A. Diffusion down a concentration gradient
B. Conversion of carbon monoxide
C. Passive transport using carrier proteins
D. Active transport using energy
Carbon dioxide moves from the blood to the alveoli through the process of diffusion. The blood has a high concentration of carbon dioxide than the alveoli.
Therefore, carbon dioxide diffuses from blood to alveoli through the cell membrane.
Therefore, the Correct Answer is A.