air sac


  • WordNet 3.6
    • n air sac any of the membranous air-filled extensions of the lungs of birds
    • n air sac any of the thin-walled extensions of the tracheae of insects
    • n air sac a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
    • ***
Webster's Revised Unabridged Dictionary
    • Air sac An alveolus.
    • Air sac (Anat) One of the spaces in different parts of the bodies of birds, which are filled with air and connected with the air passages of the lungs; an air cell.
    • ***


In literature:

In the Polytrichaceae another air space separates the spore-sac from the columella.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3" by Various
In addition to affecting the lungs, the Air Sac Mite may extend its operations to the intestines, kidneys, liver and bones.
"The Veterinarian" by Chas. J. Korinek
They inflate their bodies, having not only large lungs, but air-sacs in connection with them.
"The Outline of Science, Vol. 1 (of 4)" by J. Arthur Thomson
Each gill-plate is a tiny sac, and within these are the fine branches of the air-tubes.
"Little Busybodies" by Jeanette Augustus Marks and Julia Moody
Aerostats: a pair of large air sacs at base of abdomen in Diptera.
"Explanation of Terms Used in Entomology" by John. B. Smith
Then we had a soup made of fish's stomach, or air sac.
"Letters from China and Japan" by John Dewey
The blood tubes divide into fine branches with very thin walls and form a rich network over the air sacs.
"Health Lessons" by Alvin Davison
The blood flows through little capillaries upon the sides of the air sacs.
"Applied Physiology" by Frank Overton
Possibly the movement of the diaphragm may determine the passage of air into or out of the lung-sacs.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various
Highly specialized air-sacs are characteristic of all birds.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7" by Various
Respiration and air sacs of insects.
"A Guide for the Study of Animals" by Worrallo Whitney
But the joints of the backbone in front of the sacrum receive their air from the cervical air sac.
"Dragons of the Air" by H. G. Seeley
It was supposed at one time that the air sacs of birds contributed in some mysterious way to flight, but this is now known to be erroneous.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5" by Various
Air is admitted to this sac for respiratory and hydrostatic purposes, and it thus becomes a lung.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5" by Various
Calls are emitted quickly with a short burst of air filling the vocal sac, which immediately deflates.
"Neotropical Hylid Frogs, Genus Smilisca" by William E. Duellman
There are no laryngeal air sacs as in the Macaques.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard
It does this by paralyzing the nerves which take care of the tiny blood vessels in the walls of the air tubes and air sacs.
"A Civic Biology" by George William Hunter
Fluid leaks from the blood into the tissues and into the air sacs in parts of the lungs.
"Significant Achievements in Space Bioscience 1958-1964" by National Aeronautics and Space Administration
An air sac with cellular spaces is connected with the gullet and serves as a rudimentary lung.
"The Elements of Geology" by William Harmon Norton
Nearly all birds have some of their bones hollow, and air-sacs, or pockets, under the skin.
"The Children's Book of Birds" by Olive Thorne Miller

In news:

James Street is a long cul -de-sac off of Rock Spring Road, tucked under the on-ramp to Route 924 from Bel Air Bypass.
James Street is a long cul-de-sac off of Rock Spring Road, tucked under the on-ramp to Route 924 from Bel Air Bypass.
Emphysema (em-fa-SEE-ma) is a chronic, irreversible lung disease that slowly destroys the air sacs in the lungs.
Michels, after getting up close and personal with domestic toms, drew this conclusion about the spit and drum : " I suspect that the drum is produced by movement of the air within the sacs of the bird's chest".
A male Dusky Grouse displays, fanning its tail, tilting its body forward, and exposing its purplish air sac.
Pneumonia is usually caused by bacteria (called Streptococcus pneumoniae) and affects the tiny air sacs at the end of the breathing tubes in your lungs .
The tissue between the air sacs of his lungs is scarring.
Pneumonia is an inflammatory condition of the lung—especially affecting the microscopic air sacs (alveoli)—associated with fever, chest symptoms, and a lack of air space (consolidation) on a chest X-ray.
All great apes, including human beings, have vocal tract air sacs that they use to call out loud.
Having completed 20 years of service in the Air Force, with most of my career in Strategic Air Command (SAC), I collected a number of certificates and plaques that were cluttering up my home office 30 years after retirement.
The Bel Air girls soccer team improved to 1-0 in district with their opening win over Montwood this afternoon at the SAC.