diffusion is a critical process required for oxygen to leave the
alveoll of the lungs to enter the blood and for carbon dioxlde (a
waste gas) to leave the blood and enter the alveoll.
9. knowing what you know about how a substance travels in
diffusion, in order for oxygen to leave the alveoli and enter the
blood, there would be a (higher or lower ] concentration of
oxygen in the alveoli compared to the blood.
10. knowing what you know about how a substance travels in
diffusion, in order for carbon dioxide to leave the blood and enter the
alveoll, there would be a (higher or lower] concentration of
carbon dioxide in the alveoli compared to the blood.

11. explain your reasoning for questions #9 and #10.