sac

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Related to alveolar sacs: alveolus, alveoli

Sac:

see Sac and FoxSac and Fox,
closely related Native Americans of the Algonquian branch of the Algonquian-Wakashan linguistic stock (see Native American languages). Sac and Fox culture was of the Eastern Woodlands area with some Plains-area traits (see under Natives, North American).
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sac

[sak]
(biology)
A soft-walled cavity within a plant or animal, often containing a special fluid and usually having a narrow opening or none at all.
(mapping)
Indentation in the contour lines of equal depth showing submarine relief.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

sac

a pouch, bag, or pouchlike part in an animal or plant
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

SAC

1. An early system on the Datatron 200 series.

[Listed in CACM 2(5):16 (May 1959)].
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References in periodicals archive ?
This extends our earlier findings [26, 28-30, 34, 36, 37] and may explain why lung injury scores (i.e., increased septal thickness and decreased number of alveolar sacs) and exudate leakage from lung parenchyma are reduced in ARDS animals treated with SW plus mitochondrial therapy.
Pulmonary alveoli are composed of a myriad of alveolar sacs arranged in a fractal manner.
A more complex and physiologically realistic model was then developed that contained 45 alveolar sacs. Airflow and particle deposition in this model were compared to the simplified 4-alveoli (or 4-sac) model to determine the feasibility of using simplified alveolar models for inhalation dosimetry predictions and to evaluate the impact from gravitational orientation and inhalation depth.
To facilitate later reference to the four alveolar sacs, the upper alveolus was termed as Sac 1, the lower alveolus as Sac 4, and the left and right alveoli as Sac 2 and Sac 3, respectively (Figure 1(a), left panel).
Adult tucuxi left lung photomicrograph (HE); B: Photomicrograph of the detail of adult tucuxi (HE) left lung; C: Adult bronchodilator (HE) photomicrograph; D: Photomicrograph of detail of the presence of myoelastic sphincters in the adult tucuxi lung (HE); E: Photomicrograph of adult tucuxi alveolar sacs (SEM); F: Photomicrograph of the alveolar walls of adult boto alveolar sacs (arrow) (SEM).
Another important finding in the present study is that histopathological analysis demonstrated significant reduction in the number of alveolar sacs and notably elevated crowded score in the lung parenchyma of hypoxia-treated animals compared to those in the sham controls.
Indeed, there is a substantial evidence for interactions between alveolar epithelial cells and macrophages in alveolar sacs [2].
Macrophages are the predominant "professional" immune cell population in the distal lung, in which the alveolar epithelia are physical and functional barriers to maintain the integrity of alveolar sac, as well as play a crucial role in the clearance of environmental insults by initiating and expanding local host defense mechanisms [5, 21, 22].