How are the alveoli adapted for gas exchange?
Thin walls - only one cell thik. this makes the exchange surface very thin, shortening the diffusion distance across which gases have to move
Large surface area - they are folded , providing a much greater surface area for gas exchange to occur
Moist lining - the alveoli have a moist lining so the gases dissolve first , speeding up diffusion into the blood
Rich blood supply - each alveous is surrounded by the blood capillaries which ensure a good blood suplly . this is important as the blood is constantly taking away and bringing in more carbon dioxide…