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The terminal portion of an air passageway within the lung. Its wall is made of simple squamous epithelium and is surrounded by pulmonary capillaries. This is the site of gas exchange. Each alveolar sac is connected to a respiratory bronchiole by an alveolar duct.<\/p>\n

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The terminal portion of an air passageway within the lung. Its wall is made of simple squamous epithelium and is surrounded by pulmonary capillaries. This is the site of gas exchange. Each alveolar sac is connected to a respiratory bronchiole by an alveolar duct.  <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-198412","post","type-post","status-publish","format-standard","hentry","category-a"],"yoast_head":"\nAlveolar sac - Definition of Alveolar sac<\/title>\n<meta name=\"description\" content=\"The terminal portion of an air passageway within the lung. Its wall is made of simple squamous epithelium and is surrounded by pulmonary capillaries. This is the site of gas exchange. 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