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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: 3446

Animal Behaviour MC questions

... coloured gifts in white silk. Stålhandske wondered if the males wrapped their gifts in order to make them look like the white, silk‐covered egg sacs that mated females make and hold in their jaws to protect until the spiderlings hatch. (4 marks) i. The last sentence in the paragraph above constitutes: ...

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by mushroom
Thu Oct 27, 2011 4:44 am
Forum: Zoology Discussion
Topic: Animal Behaviour MC questions
Replies: 3
Views: 4365

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: 30541


... the enzymes required to produce carbohydrate molecules. Another system of membranes suspended in the stroma, consisting of set of flat disc like sacs called thylakoid. The thylakoid membrane encloses a fluid filled lumen or space, which is separated by thylakoid membrane with stroma. The chlorophyll ...

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by sara135
Tue Jul 12, 2011 11:57 am
Forum: Microbiology
Replies: 3
Views: 16180

Re: Theories - Origin of Life

... inside a cell increases, causing cell membranes to rupture. Single membranes surrounding organelles called lysosomes tend to dissolve first. The sacs contain digestive enzymes normally used by cells to break down organic molecules such as proteins. As these enzymes spill out, they begin digesting ...

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by scottie
Thu Jun 09, 2011 2:07 pm
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 563
Views: 1131051
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