duct

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Related to Alveolar ducts: alveolar sacs

duct

1. any bodily passage, esp one conveying secretions or excretions
2. a narrow tubular cavity in plants, often containing resin or some other substance
3. a channel or pipe carrying electric cable or wires

Duct

A nonmetallic or metallic tube for housing wires or cables, may be underground or embedded in concrete floor slabs; a duct usually fabricated of metal, used to transfer air from one location to another.

duct

[dəkt]
(anatomy)
An enclosed tubular channel for conducting a glandular secretion or other body fluid.
(communications)
An enclosed runway for cables.
(geophysics)
The space between two air layers, or between an air layer and the earth's surface, in which microwave beams are trapped in ducting. Also known as radio duct; tropospheric duct.
(mechanical engineering)
A fluid flow passage which may range from a few inches in diameter to many feet in rectangular cross section, usually constructed of galvanized steel, aluminum, or copper, through which air flows in a ventilation system or to a compressor, supercharger, or other equipment at speeds ranging to thousands of feet per minute.

duct

1. ,See air duct.
2. In electric systems, a metallic or nonmetallic tube, (usually circular, oval, rectangular, or octagonal) for housing wires or cables; may be underground or embedded in concrete floor slabs.

duct

A thin-wall tube installed in aircraft air-conditioning and heating systems to carry heated or cooled air for distribution to various aircraft locations.
References in periodicals archive ?
Organizing pneumonia (OP) is a nonspecific term for proliferations of fibroblastic tissue within small airways, alveolar ducts, and alveolar spaces.
36,37) Diffuse alveolar damage may contain organizing fibroblastic tissue within alveolar ducts in particular, but this is not the dominant finding, and OP lacks the hyaline membranes or acute DAD and does not show the prominent interstitial myxoid fibrosis or prominent type 2 pneumocyte hyperplasia of the organizing phase of DAD.
2]-NB caused an inflammatory response at the terminal bronchiol ar region and the alveolar duct bifurcation region of the distal lung in mice 1 day after OPA delivery (Figure 2).
2]-NB-exposed mice show inflammatory lesions primarily localized to alveolar duct bifurcations.
Muscularization of the normally poorly muscularized small arteries/arterioles adjacent to alveolar ducts (immunohistochemistry for smooth muscle actin, original magnification x20).
Differentiated bronchiolar epithelium in alveolar ducts of rats exposed to ozone for 20 months.
Organizing pneumonia: loose fibromyxoid plugs of granulation tissue with stellate myofibroblasts-filled alveolar ducts and airspaces with mild alveolar septal mononuclear infiltrate (hematoxylin-eosin, original magnification X200).
Species with branching respiratory bronchioles between the terminal bronchiole and alveolar ducts have more complex acini.
Axial dispersion in respiratory bronchioles and alveolar ducts.
The changes involve terminal bronchioles, respiratory bronchioles, and alveolar ducts.
Organizing fibroblastic tissue may be observed in air spaces, particularly the alveolar ducts (alveolar duct fibrosis), but this feature is typically not prominent and does not constitute the dominant finding as seen in cases of OP.
The extent of centrilobular nodules correlated with the number of macrophages in respiratory bronchioles and with chronic inflammation of respiratory bronchioles, whereas the extent of ground-glass opacity correlated with the amount of macrophage accumulation in the alveoli and alveolar ducts.