Air Sac

  • (noun): Any of the thin-walled extensions of the tracheae of insects.
    See also — Additional definitions below

Some articles on air:

Scipionyx - Paleobiology - Physiology - Respiration
... argument against the idea that birds, whose lungs are ventilated by air-sacs, are coelurosaurian theropods, and an indication theropods were cold-blooded ... that such a trait is compatible with an air-sac system ... been hypothesised to have been the location of a large air-sac ...

More definitions of "air sac":

  • (noun): Any of the membranous air-filled extensions of the lungs of birds.
  • (noun): A tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways.
    Synonyms: alveolus, air cell

Famous quotes containing the word air:

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    Philip Larkin (1922–1986)