air sac


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Related to air sac: bronchiole

al·ve·o·lar sac

1. terminal dilation of the alveolar ducts, which give rise to alveoli in the lung; a small air chamber in the pulmonary tissue from which the pulmonary alveoli project like bays and into which an alveolar duct opens; Synonym(s): sacculus alveolaris [TA]
2. in birds, air-containing extensions of bronchi that connect with bone cavities.
Synonym(s): air sac

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

a small, terminal cavity in the lung, consisting of the alveoli connected to one terminal bronchiole.
Air sacclick for a larger image
Fig. 18 Air sac . The air-sac system of a bird (left-side).

air sac

a thin-walled extension to the lungs, present in the thorax, abdomen and bones of birds. Air sacs also occur as diverticula (outgrowths) of the TRACHEA in insects, where, as in birds, they are important in respiration.

sac

a pouch; a baglike organ or structure. See also conjunctival sac.

air sac
1. alveolar sac.
2. one of the large air-filled diverticula of the respiratory system of birds. See also air sacs.
allantoic sac
alveolar s's
the spaces into which the alveolar ducts open distally, and with which the alveoli communicate.
anal sac
endolymphatic sac
the blind, flattened cerebral end of the endolymphatic duct.
heart sac
the pericardium.
hernial sac
the peritoneal pouch that encloses a herniated viscus or mesentery.
lacrimal sac
see lacrimal sac.
paranal sac
pleural sac
the pleura-lined cavity which contains the lung.
ruminal sac
one of the dorsal and ventral sacs of the rumen which are themselves further subdivided to create a caudodorsal sac and a caudoventral sac.
yolk sac
the extraembryonic membrane connected with the midgut; in vertebrates other than true mammals, it contains a yolk mass. See also yolk sac.
References in periodicals archive ?
Some of the models contained an air sac, the Daily Mail reported.
Sans his air sac, the 365-pound orangutan still had pneumonia and scarred lung tissue that made it hard to breathe in the dust kicked up by massive zoo construction.
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.
Further macroscopic changes were division of testicular tissue and thickened air sac membranes.
Key words: air sac cystadenocarcinoma, axillary mass, metastases, avian, timneh African grey parrot, Psittacus erithacus timneh
5-mm air sac cannula was placed in the left caudal thoracic air sac and secured with 4-0 nylon monofilament suture (Ethicon, San Angelo, TX, USA).
All swab samples from poultry after contact with infected pigs or from poultry inoculated through the air sac were negative for virus (Table).
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.
Research on the new drug is targeting the receptors which make the air sacs grow, allowing them to grow back healthily.
Over time, the elasticity of lung tissue is lost, causing air to be trapped in air sacs and impairing the exchange of oxygen and carbon dioxide.
Their small size allows them to easily enter the air sacs in the lungs, where they can cause breathing problems.