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→About The Walls of the Alveoli as an Exchange Surface
:*[[Alveoli]] are in groups to make a large [[Surface Area|surface area]] in the [[lung]] for gas exchange.
:*The [[alveoli]] have a good [[blood]] supply to allow gas exchange with the [[blood]].
:*The walls of the [[alveoli]] are kept moist to allow [[gasegas]]s es to [[dissolve]] into to the fluid for gas exchange with the [[blood]].
===About The Wall of the Small Intestines as an Exchange Surface===