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Air sac is an anatomical term with several meanings:
- Pulmonary alveolus, informally known as an air sac, one of innumerable spherical outcroppings of the respiratory bronchioles in the mammalian lung, the secondary sites of gas exchange with the blood
- an anatomical structure continuous with the trachea found in some insects which can be used to actively pump air throughout the body
- an anatomical structure unique to the dinosaur and bird respiratory systems that allows unidirectional flow of air into the lungs and through the body
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- This page was last modified on 16 July 2008, at 13:41.
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