Chorion vs Placenta vs Allantois

[w4nt2baDDS]

In birds and reptiles I know the chorion = gas exchange and the allantois = waste storage.

In mammals though, I know the chorion becomes fetus' contribution to the placenta and the allantois becomes the umbilical cord... but does that mean both the chorion and the allantois are both involved waste and gas exchange in mammals?

If the question asked: Which of the following allows for gas exchange in mammals during embryology?

A) Allantois
B) Placenta
C) Umbilical Cords
D) Chorion

what would be the answer?

Appreciate the feedback

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[w4nt2baDDS]

The correct answer is D - placenta.

Okay, I just got this question wrong and it relates to the question I asked yesterday.

Why isn't the answer chorionic villi? What do chorionic villi do? I would assume gas and waste exchange.


Also, if gas exchange occurs across the placenta then where does waste exchange occur? Same way? In non-mammals the gas and waste are handled by separate structures.

 

[w4nt2baDDS]

This thread helped: http://forums.studentdoctor.net/threads/embryonic-gas-exchange-site.926647/

 

[tooth_hurty]

I also found this video to be helpful, I'd recommend watching at 1.5x speed:

 

[w4nt2baDDS]

Thanks for the video, I really like his lectures. Gives me a better visual of things.

 

[tooth_hurty]

Thanks for the video, I really like his lectures. Gives me a better visual of things.

No problem!