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nephridia vs kidney

Thu Oct 13, 2005 7:52 pm

As I was reading over my motes on Mollusca I came across:
" Mollusca have two nephridia which are sometimes called kidneys because of their colour and role"

Could someone explain what the difference between nephrida and kidneys are? Dont they have the same role i.e. to excrete nitrogonous wastes?

Thanks

Re: nephridia vs kidney

Thu Oct 13, 2005 8:08 pm

fran008 wrote:As I was reading over my motes on Mollusca I came across:
" Mollusca have two nephridia which are sometimes called kidneys because of their colour and role"

Could someone explain what the difference between nephrida and kidneys are? Dont they have the same role i.e. to excrete nitrogonous wastes?

Thanks


Nephridia have the same role as kidneys, but are far from being as complicated. They are rather proto-kidneys here yyou will find a small sketch of the structure of a nephridia, if you have an idea of how a kidney look like, you will understand.
In fact to me the nephridia reminds more of a single nephron of the kidney.

Patrick

Fri Oct 14, 2005 11:23 am

Yup, agree with Dave...human kidneys are the complex one, before they become kidneys, they've to go through series of evolution since we're inside the womb.
Pro-nephros --> meta-nephros --> Kidneys

while I think that Nephridia or Nephridiophor is classified into pro-nephros..IMMSMR.

Thanks

Fri Oct 14, 2005 3:25 pm

Thanks, so basically what makes up a 'true' kidney are the nephrons...if i may draw this conclusion. Am I right?

Fri Oct 14, 2005 5:32 pm

@fran008
yes you are right

@victor
No, you are wrong. nephridia is nephridia. You find them at some invertebrates(planaria, earth worm, moluscs-but here they are modified metanephridia called the Bojanus organs). pronephros is the first evolutionary stage of the vertebrate kidney. You find in Agnatha.

By the way, nephridiopor is the orifice that the metanephridia opens on the outside. it opens on the inside by the nephrostom. You can find this at Lumbricus terrestris. The nephrostom from the metanephridia of one segment opens in the segment in front.

Is everything cristal clear now?

Sat Oct 15, 2005 12:28 pm

yes yes tnx loadz

Mon Oct 17, 2005 12:54 pm

Yes sir, it's a crystal clear now... :lol:
Um, by the way, is the nephridia same like flame cell?? because planaria uses flame cell isn't it?

Mon Oct 17, 2005 6:11 pm

Well, i have no ideea what flame cell is but planaria uses protonephridia. it is a system of tubules that ends with something called in romanian "a cell with vibrating flamura"- Maybe this is translated as flame cell. Anyway the important thing about these structures is that they are opened at only one end-towards the exterior. This structure is called nephridiopor-as opposed to metanephridia which are open at both ends

Thu Oct 27, 2005 2:56 pm

Flame Cells are used for excreting water waste

Sat Nov 05, 2005 11:07 pm

yah but also,

Well, i have no ideea what flame cell is but planaria uses protonephridia. it is a system of tubules that ends with something called in romanian "a cell with vibrating flamura"- Maybe this is translated as flame cell. Anyway the important thing about these structures is that they are opened at only one end-towards the exterior. This structure is called nephridiopor-as opposed to metanephridia which are open at both ends

that is not always tru
@fran008
yes you are right

@victor
No, you are wrong. nephridia is nephridia. You find them at some invertebrates(planaria, earth worm, moluscs-but here they are modified metanephridia called the Bojanus organs). pronephros is the first evolutionary stage of the vertebrate kidney. You find in Agnatha.

By the way, nephridiopor is the orifice that the metanephridia opens on the outside. it opens on the inside by the nephrostom. You can find this at Lumbricus terrestris. The nephrostom from the metanephridia of one segment opens in the segment in front.

Is everything cristal clear now?

victor was sumwhat rite, in some animals that happens

Nephridia have the same role as kidneys, but are far from being as complicated. They are rather proto-kidneys here yyou will find a small sketch of the structure of a nephridia, if you have an idea of how a kidney look like, you will understand.
In fact to me the nephridia reminds more of a single nephron of the kidney.

great sketches

Wed Nov 16, 2005 10:45 am

victor wrote:Yes sir, it's a crystal clear now... :lol:
Um, by the way, is the nephridia same like flame cell?? because planaria uses flame cell isn't it?

hey ,, wat does it mean
---In the north Pole, why Bears dissolved into the water? Because it's polar.---

wat funny thing is this
??????????????

Wed Nov 16, 2005 12:08 pm

Hahahaha thats so funny,well polar solvents can easily dessolve in water.
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