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Sep 24, 2009
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a lot of questions will ask to id the extraembryonic membrane based on a description, specifically, "which membrane serves in gas exchange"..

both the chorion and allantois exchange gas between the embryo, and sometimes then answer will be one or the other. is there one that is dominant in the gas exchange role? unless the question lists other functions of the membrane, not sure how i would be able to tell..
 

Bis-GMA111

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Nov 7, 2010
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gas exchange=chorion. wastes=allantois
 

wired202808

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gas exchange=chorion. wastes=allantois
be careful here, chorion turns into the placenta and helps to transfer nutrients
but allantois does both wastes (nitrogenous) AND gas exchange

see wikipedia as a source, i also believe this question was asked in the destroyer or elsewhere but allantois actually has 2 functions.
 

jp313

7+ Year Member
Mar 27, 2011
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Allantois can be used as nitrogenous waste and as a gas exchange as well because the vessel of this structure lie close enough to the surface of the cell which allows gas exchange
 
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