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Gill

Gill

a woody glen; a narrow valley containing a stream.

Origin: Icel. Gil.

1. (Science: anatomy) An organ for aquatic respiration; a branchia. Fishes perform respiration under water by the gills. (Ray)

gills are usually lamellar or filamentous appendages, through which the blood circulates, and in which it is exposed to the action of the air contained in the water. In vertebrates they are appendages of the visceral arches on either side of the neck. In invertebrates they occupy various situations.

2. (Science: botany) The radiating, gill-shaped plates forming the under surface of a mushroom.

3. (Science: zoology) The fleshy flap that hangs below the beak of a fowl; a wattle.

4. The flesh under or about the chin.

5. One of the combs of closely ranged steel pins which divide the ribbons of flax fibre or wool into fewer parallel filaments. [Prob. So called from f. Aiguilles, needles] gill arches, gill bars.

(Science: anatomy) horny filaments, or progresses, on the inside of the branchial arches of fishes, which help to prevent solid substances from being carried into gill cavities.

Origin: dan. Giaelle, gelle; akin to 75c

Sw. Gal, Icel. Gjolnar gills; cf. As. Geagl, geahl, jaw.

1. A young woman; a sweetheart; a flirting or wanton girl. Each jack with his gill.

2. (Science: botany) The ground ivy (nepeta Glechoma); called also gill over the ground, and other like names.

3. Malt liquor medicated with ground ivy. Gill ale. Ale flavored with ground ivy.

(Science: botany) alehoof.

Origin: Abbrev. From Gillian. Any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus.


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Re: The Most Primitive Respiratory System

... birds and mammals are very similar and this are evidence that they evolved from a distant common ancestor. Embroyology shows that all have gill slits and tails in their embroyos like those of a fish." The ontogeny recapitulates phylogeny concept was rejected by science a long tme ago. ...

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by JorgeLobo
Fri Apr 27, 2012 1:39 am
 
Forum: Evolution
Topic: The Most Primitive Respiratory System
Replies: 11
Views: 4854

The Most Primitive Respiratory System

... birds and mammals are very similar and this are evidence that they evolved from a distant common ancestor. Embroyology shows that all have gill slits and tails in their embroyos like those of a fish. I can use this theory to pick fish out as the animal that has the most primitive respiratory ...

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by chikis
Thu Mar 22, 2012 12:21 am
 
Forum: Evolution
Topic: The Most Primitive Respiratory System
Replies: 11
Views: 4854

respiration of holocephali and the evolution of operculum

as the title says i would appreciate some help about respiration of holocephali and the evolution of operculum and the one gill opening thx

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by Munjarak
Wed Feb 29, 2012 8:26 pm
 
Forum: Zoology Discussion
Topic: respiration of holocephali and the evolution of operculum
Replies: 0
Views: 793

Re:

Think about why a fish would need relativley more gill than another? what advantage that would provide? which of those 2 environments would favour such an evolution? This is also related to the way gas diffuse in water... I agree. The deeper the ...

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by Trevor
Fri Dec 30, 2011 2:13 pm
 
Forum: Zoology Discussion
Topic: bottom and surface dwelling fish
Replies: 11
Views: 3864

bottom and surface dwelling fish

Think about why a fish would need relativley more gill than another? what advantage that would provide? which of those 2 environments would favour such an evolution? This is also related to the way gas diffuse in water...

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by canalon
Thu Dec 29, 2011 6:25 pm
 
Forum: Zoology Discussion
Topic: bottom and surface dwelling fish
Replies: 11
Views: 3864
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