Amniotes

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7 Terms

1
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Yolk sac birds

holds yolk, food

2
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yolk sac mammals

early on, for gas exchange and is source of primordial germ cells and 1st red blood cells. Later it degenerates

3
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allantois birds

holds waste

4
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allantois mammals

aids in waste collection and part of umbilical cord

5
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amnion

fluid filled sac, keeps embryo moist

6
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chorion bird

gas exchange through shell

7
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chorion mammals

forms extensive villi with extensive blood vessels for gas, nutrient, and waste exchange with maternal blood