Biology - Gas Exchange, Alveoli??? Please help!

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    This may sound stupid but I'm so confused and stressed about this.
    I read about 'adaptions for exchanging materials' and it gave a list but then it said that the alveoli is adapted for gas exchange and I'm assuming its the same thing??? When it says exchange surface does it just mean alveoli? I tried looking on here but I don't understand the way they word it and I can't download anything so can someone please explain gas exchange to me?
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    I think it means-
    - Exchange with alveoli
    - Exchange in the gut wall

    And how they are adapted:
    - Maintenance of steep concentration gradient (good blood supply from capillaries)
    - Moist surfaces
    - Large surface areas (micro villi in gut and grape shaped alveoli)
    - Short diffusion pathway in alveoli

    Etc
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    Exchange with aveoli basically means the exhange with oxygen and carbon dioxide in the blood if that helps?


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