air sac

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air sac

n.
1. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation.
2. See alveolus.
3. A saclike, thin-walled enlargement in the trachea of an insect.
4. An inflatable pouch attached to the larynx in certain mammals, including the nonhuman great apes.

air sac

n
1. (Zoology) any of the membranous air-filled extensions of the lungs of birds, which increase the efficiency of gaseous exchange in the lungs
2. (Zoology) any of the thin-walled extensions of the tracheae of insects having a similar function

air′ sac`


n.
2. any of certain cavities in a bird's body connected with the lungs.
[1820–30]

air sac

1. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities. See alveolus.
2. A sac-like enlargement in the trachea of an insect.
3. A bag-like piece of skin or tissue below the jaw of certain animals, such as the bullfrog and orangutan, that can be inflated to increase sound production.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.air sac - a tiny sac for holding air in the lungsair sac - a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
lung - either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood
sac - a structure resembling a bag in an animal
2.air sac - any of the thin-walled extensions of the tracheae of insects
insect - small air-breathing arthropod
sac - a structure resembling a bag in an animal
3.air sac - any of the membranous air-filled extensions of the lungs of birds
bird - warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
sac - a structure resembling a bag in an animal
References in periodicals archive ?
The lung-on-a-chip microdevice takes a new approach to tissue engineering by placing two layers of living tissues-the lining of the lung's air sacs and the blood vessels that surround them-across a porous, flexible boundary.
The Dikika girl's hyoid resembles hyoids of living nonhuman apes, suggesting that she possessed air sacs in her neck as apes do, says coauthor Fred Spoor of University College London.
Later in life, this may lead to lung cancer or emphysema--a lung disease that destroys the walls of the lungs' air sacs (see bottom half of this smoker's lung).
Idiopathic pulmonary fibrosis, or IPF, develops from damage to the alveoli, the tiny air sacs in the lungs that exchange oxygen from inhaled air for carbon dioxide in the blood.
Grossly the air sacs were opaque, severely thickened, and red with multifocal to coalescing white to yellow shiny raised plaques with gray to green, sometimes fuzzy, centers, 0.
She said that pneumonia is infection of the small air sacs of the lungs and surrounding tissues and the infection causes inflammation and deterioration of lung function.
Damage to the delicate walls of the air sacs in the lungs means the lungs lose their normal elasticity.
A major potential problem immediately after lung transplantation is dysfunction of sodium channels in the alveoli, tiny air sacs where oxygen uptake occurs, impairing the sacs' ability to clear fluid into the lymphatic system.
Only after decomposition breached the birds' internal air sacs and permitted water to flow into those cavities did the body parts finally sink, says Krauss.
more alveoli, the tiny air sacs in lungs through which oxygen enters the blood
In this disease, the tiny air sacs in the lungs called alveoli are damaged, causing the lungs, which normally stretch as a person breathes in, to lose their elasticity.
However, birds have air sacs, and a metastasis may spread from the air sacs into the abdominal cavity as well as to the lungs.