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air sac |
Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson | 0.01 sec. |
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air sac [′er ‚sak] (geology) (invertebrate zoology) One of the large, thin-walled structures associated with the tracheal system of some insects. (vertebrate zoology) In birds, any of the small vesicles that are connected with the respiratory system and located in bones and muscles to increase buoyancy. |
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| ? Mentioned in | ? References in periodicals archive | |
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Ponganis, his Scripps colleague Torrence Knower Stockard, and an
international team found that when diving, penguins nearly deplete the
oxygen in the special avian air sacs attached to their lungs. On Day 8, the class ``candled'' the eggs with a film
strip projector to see the air sac and the embryo, which looks like a
question mark. The ruptured air sac wails make
breathing extremely difficult. |
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