These cells pick up gases from air sacs:
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They extend like tree branches into the lung. The bronchioles (bron-kee-oles) branch out from the bronchi into even smaller tubes. The alveoli (al-vee-oh-lie) are tiny air sacs at the end of the bronchioles (bron-kee-oles). Red blood cells drop off carbon dioxide and pick up fresh oxygen here.
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