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air sac

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Definition of air sac in English:

noun

1A lung compartment containing air; an alveolus.
Example sentences
  • This prohibits us from observing and analyzing the dynamic changes of the entire air sac.
  • Each air sac is surrounded by elastic fibers that help the lung recoil after inspiratory stretching.
  • When lungs are damaged by tobacco the crimping elastic cells surrounding each air sac are broken and lungs become over inflated.
1.1An extension of a bird’s lung cavity into a bone or other part of the body.
Example sentences
  • All birds have an extensive air sac system in the thorax and abdomen.
  • The lung / air sac system of birds profoundly affects their physiology.
  • The two researchers examined the air sac systems of some 200 modern birds and identified specific patterns showing which air sacs are found in which bones.

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