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Author Topic: How do developing chicks breath inside an egg?  (Read 3983 times)

Offline Joe L. Ogan

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How do developing chicks breath inside an egg?
« on: 24/04/2012 14:33:51 »
What keeps a chicken from being asphixated before it gets strong enough to break the egg shell and get a breath of air?  Thanks for comments, Joe L. Ogan
« Last Edit: 25/04/2012 08:22:11 by chris »


 

Offline Nizzle

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The egg shell is porous and O2-gas just diffuses everywhere it needs to be
 

Offline Joe L. Ogan

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Yes, I see your point.  I just have some reservations about the egg shell being so porous.  Thanks for comments.  Joe L. Ogan
 

Offline Lmnre

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... however, the embryo or chick doesn't breathe with its lungs while inside the shell until it begins to hatch. Tissue called the allantois looks somewhat like an umbilical cord and placenta and acts somewhat like lung tissue by connecting the chick's circulatory system to the porous egg shell. It exchanges gases through the shell by absorbing oxygen and expelling carbon dioxide (and it also absorbs calcium from the shell for use in bone production, and it stores toxic metabolic by-products). The vitelline membrane also exchanges gases, but to a lesser extent.

Here's another website on this.

(This was an excellent question!)
 

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