Question

During diffusion of carbon dioxide between blood and air, which of the following condition is true?

• A. The concentration of carbon dioxide is higher in blood
• B. The concentration of carbon dioxide is higher in air
• C. The concentration of carbon dioxide is the same in blood and air
• D. Nothing can be said about the concentration of carbon dioxide

Answer 1

The correct option is A

The concentration of carbon dioxide is higher in blood

When a substance diffuses, it moves from a region of higher concentration to a region of lower concentration. Thus, carbon dioxide is expelled from the blood into the air in the lungs because the concentration of carbon dioxide in blood is greater than that in the air.