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Postby Lazar » Thu Jan 27, 2005 8:40 pm

Hi, all,

Does anyone happen to know how many [very roughly] genera have a partially separated heart chamber or a partially developed septum? If you compared the number of organisms with (say) 3 or 4- chambered heart with the number of "intermediate" ones with only partially separated chamber, what would be the ratio between them [again very roughly]?

Any input is appreciated.

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Postby thank.darwin » Thu Feb 10, 2005 11:16 pm

Can you try to be more specific... I don't know what you are asking
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Postby mith » Fri Feb 11, 2005 8:24 pm

Well first off, most animals have chambered hearts. Humans have 4 chambers which is divided by the septum in the middle and two valves. But I think like reptiles and such have 3 chambered hearts. So basically to find your answer we have to count all the (did you mean genus?) types that have 3 versus those that have 4.
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Postby MrMistery » Mon Mar 07, 2005 9:16 pm

Class Cyclostomata(vertebrates without jaws) have to heart chambers-1 atrium(or auricle) and 1ventricle. Fish also have the same kind of heart-2 chambers. Amphibians have a 3 chambered heart: 2 atriums and 1 ventricle. Reptiles have 2 atriums and 1 ventricule that has a septum that separates it incompletly into two chambers. At crocodiles the separation is complete and the heart becomes "with 4 chambers". Birds and mamals also have a heart with 4 chambers
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