previous use of vestigial organs

Genetics as it applies to evolution, molecular biology, and medical aspects.

Moderators: Leonid, amiradm, BioTeam

Post Reply
vinaya
Death Adder
Death Adder
Posts: 78
Joined: Tue Sep 06, 2005 2:17 pm

previous use of vestigial organs

Post by vinaya » Sat Oct 29, 2005 3:23 am

what were the uses of vestigial organs of humans before they became useless?
like the appendix, the nictitating membrane .......
because they are still quite useful in other organisms
like the appendix is still useful in herbivores, the nm in birds,........
so, why did they become useless in humans :?: :?:

vinaya
Death Adder
Death Adder
Posts: 78
Joined: Tue Sep 06, 2005 2:17 pm

Post by vinaya » Sun Oct 30, 2005 9:38 am

pls
i need reply urgently if u dont get my question, pls ask ur doubt

User avatar
Morris
Death Adder
Death Adder
Posts: 57
Joined: Sat Oct 22, 2005 2:42 pm
Location: Italy

Post by Morris » Sun Oct 30, 2005 10:28 am

I think some human organs are only a remembering of our origins and evolution; and they become useless because we don't need them.

User avatar
MrMistery
Inland Taipan
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:

Post by MrMistery » Sun Oct 30, 2005 10:41 am

Think of it like this: Herbivores have a diet based completely on vegetation(duh, that's what their name means :D ) so they need to digest cell walls. They do so by the help of bacteria in the vermiform appendix. But at humans, the most nutrients come not from cellulose, but from other substances, easier to digest. Therefore it was useless to consume energy on having an organ that wouldn't do much... If natural selection would still act upon us as every other organism, these organs would dissapear.. Got it?
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

vinaya
Death Adder
Death Adder
Posts: 78
Joined: Tue Sep 06, 2005 2:17 pm

Post by vinaya » Mon Oct 31, 2005 3:34 am

8)
maybe the nm performs the work of eyelids.as v already have some protection the nm got destroyed
errrr is that right.....????????
ummm do birds have eyelids ?

User avatar
Poison
Inland Taipan
Inland Taipan
Posts: 2322
Joined: Sun Jan 02, 2005 12:44 pm
Location: Turkey

Post by Poison » Mon Oct 31, 2005 7:32 pm

As much as I know, yes they have.
It matters not how strait the gate
How charged with punishment the scroll
I am the Master of my fate
I am the Captain of my soul.

Leesa
Garter
Garter
Posts: 19
Joined: Fri Nov 11, 2005 10:32 pm

Post by Leesa » Tue Nov 15, 2005 7:35 am

I don't know why they became useless, but it does seem pointless using the appendix when its simply not neccessary. We have 2 forms of digesting processes, the mechanical digestion, and the chemical digestion. The mechanical is breaking down the food with teeth, and then the chemical : The different enzymes in our digestive system allow the break down of complex molecules. Like Koalas, they use the protozoans in their stomach, to break down the food.

User avatar
MrMistery
Inland Taipan
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:

Post by MrMistery » Tue Nov 15, 2005 7:36 pm

they became useless because, considering our diet it was no use keeping those structures and wasting energy
@Leesa
We also have physical digestion
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests