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Air sacs

Air sac

(Science: zoology) Thin-walled sacs or spaces which function as a part of the respiratory system in birds, fishes, insects, and mammals.

The sacs are filled with air and connected with the air passages of the lungs; an air cell.

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Are bidirectional lungs essential for human speech?

... research on avian respiration and their fancy unidirectional lungs (air flows in one direction through the lungs, thanks in part to supplementary air sacs), and wondered what effect having a similar system, or really any sort of unidirectional ...

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by NMLevesque
Tue Nov 19, 2013 10:53 pm
Forum: General Discussion
Topic: Are bidirectional lungs essential for human speech?
Replies: 3
Views: 2537

why do we yawn???

... use anywhere near our lung capacity; for the most part, we just use the air sacs at the bottom of the lungs. If the air sacs, called alveoli, don’t get fresh air, they ...

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by santana8
Wed Aug 24, 2011 12:27 pm
Forum: Physiology
Topic: why do we yawn???
Replies: 21
Views: 27814

Theories - Origin of Life

... simply move the esophagus in front of (anterior to) the trachea so the air pathway and the food/water pathway don't cross each other. Avian respiratory ... isn't trapped easily like the back of our pharynx. A system of air sacs then direct air through the lung in only one direction which keeps ...

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Wed Apr 13, 2011 12:30 am
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 560
Views: 907860

Re: Theories - Origin of Life

... pain that humans are so prone to. Only an idiot would have the path of air into the lungs cross the path of food and water into the stomache. Serious ... very inefficient. Birds have a better system that uses a series of air sacs to push air through the lung in only one direction. Heck if I was ...

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Sun Mar 20, 2011 4:36 am
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 560
Views: 907860

Perspiration among carnivores [mammals].

... kangaroos have red sweat. Birds resort to panting, losing water from air sacs. Dogs also adopt panting. Their tongue has rich blood supply from where water is evaporated. ...

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by thehundredthone
Tue Mar 27, 2007 6:10 am
Forum: Zoology Discussion
Topic: Perspiration among carnivores [mammals].
Replies: 11
Views: 8663
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