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Air sac generally refers to an organ or portion of an organ containing air within an animal's respiratory system. It may refer specifically to:
Pulmonary alveolus, small hollow cavities which are a part of the lungs within mammals
Air sacs, structures in the saurischian dinosaur respiratory system, including the extant bird respiratory system
Topics referred to by the same term
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This disambiguation page lists articles associated with the title Air sac.