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Air sac

Air sac

(Science: zoology) Thin-walled sacs or spaces which function as a part of the respiratory system in birds, fishes, insects, and mammals.

The sacs are filled with air and connected with the air passages of the lungs; an air cell.


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Bird-Dinosaur News

... not have had a lung that worked like that in birds. Their abdominal air sac, if they had one, would have collapsed. That undercuts a critical piece of supporting evidence ...

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by AFJ
Sun Jun 14, 2009 1:42 pm
 
Forum: Evolution
Topic: Bird-Dinosaur News
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The Fiber Disease

... on fish it has been shown that the early life stages (embryo, yolk sac-fry and juveniles) are the most sensitive to the impacts of toxicants ... The leaves were thoroughly washed in water to remove sand and debris, air-dried under low intensity sunshine (25°C) for one week, and then oven ...

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... constituent. There are about 25,000 species, most comprised of a sac fungus (Ascomycete) and a green alga of the genus Trebouxia or Trentepohlia ... red, orange, or brown. Lichens require no food source other than light, air, and minerals. They depend heavily on rainwater for their minerals and ...

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Fri Feb 03, 2006 9:29 pm
 
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