uwl-280-145
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  Alveolar sac (close-up)

Unit_14-09a
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 1. Alveoli

 

 2. Alveolar sac

 3. Simple squamous epithelium

 4. Blood vessel

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This image shows a single alveolar sac, which is formed by from a group or cluster of alveoli.  Two blood vessels and numerous alveoli can also be seen.

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