The alveoli have are thin, this allows gasses to diffuse through them easily.
They are small and there are many of them meaning there is a large surface area through which much gas can diffuse at once. It also means there is a lot of surface in contact with the blood stream for gasses to diffuse into.
Alveoli have a moist lining for gasses to dissolve into.
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ReplyDeleteread "have" as "walls" or "lining"
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ReplyDeleteThin Wall
Rich capillary network
Increased surface area: volume ration
Moist
Moving blood
In a normal person the alveoli have lots of folds in them to increase surface area further (with emphysema the alveoli walls break down getting rid of the folds meaning the person has difficulty with getting enough oxygen)
ReplyDeletejust wanted to say that the walls are 1cell thick so a short diffusion distance for the exchange of O2 and CO2 but thanks hanna!!
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