air sac

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air sac

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.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

air sac

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

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

air′ sac`

1. alveolus (def. 2).

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.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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Noun	1.	air sac - a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways air cell, alveolus 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 ?

At necropsy, a Diplotriaena nematode was found in a cranial air sac. Although no obvious gross pathologic changes were attributed to the nematode, histologic changes of bronchial epithelial hyperplasia and goblet cell metaplasia, consistent with chronic airway irritation were found in the lungs associated with Diplotriaena eggs.

Diplotriaena--An Air Sac Nematode Found in a New Holland Honeyeater (Phylidonyris novaehollandiae)

It includes a visually stunning proof-of-principle -- a hydrogel model of a lung-mimicking air sac in which airways deliver oxygen to surrounding blood vessels.

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Pneumonia is an infection that occurs in the air sac of the lungs, causing it to fill it with pus or fluid.

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Diabetics also had increased pulmonary fibrosis-a condition where the air sac in the lung becomes stiff and scarred.

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Using a Leica DM 1000 light microscope, examination of hematoxylin and eosin stained histology slides revealed the abdominal air sac wall was diffusely thickened by an exudate of fibrin, heterophils, and fewer macrophages with entrapped oxalate crystals (Figure 3).

Aspergillus Section Nigri-Associated Calcium Oxalate Crystals in an Eurasian Eagle Owl (Bubo bubo)

In emphysema, the air sac walls become damaged and they can become enlarged, trapping air and making it more difficult to push air out of the lungs.

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In addition, 28 chickens (1 week of age) and 28 turkeys (1 week of age) were inoculated with 200 [micro]L of virus suspension ([10.sup.6] [TCID.sub.50]) directly into the left air sac. Six fattening turkeys (16 weeks of age) from a local flock were inoculated oculo-oronasally with [10.sup.6] [TCID.sub.50] of A/Regensburg/ D6/09 (H1N1) virus.

Limited susceptibility of chickens, turkeys, and mice to pandemic (H1N1) 2009 virus

These 19 papers describe and evaluate a range of assay methods and associated topics, including endothelial cell biology, proliferation and migration assays, assays of tubule formation, models of the effects of the hemodynamic environment, whole or partial vessel outgrowth assays, endothelial-mural cell interactions, membrane and intracellular signaling events, implantation of sponges and polymers, assays in the chick, corneal assays, dorsal air sac models, chamber assays, tumor models, imagable models and vascular imaging, biological and clinical impact of the use of stem cells, a novel trial design of novel monitoring methods and future directions.

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Oxygen seeps through the air sac walls into your blood.

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coli serotype 02 to cause an air sac infection, called air saculitis, in broiler chickens.

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"I've had bad air sac birds that had yellow pus visibly coming out of their insides, and I was told to save the breast meat off them...

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Transplanting regionally specific lung tissue (proximal or distal) from mice and humans generates TELu with typical location-specific tissue markers such as particular alveolar or air sac cells in the distal TELu or tracheal epithelial cells organized with cartilage and ciliated appendages for proximal lung.