Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 43 - Animal Development - 43.5 - Extraembryonic Membranes Nurture Avian and Mammalian Embryos - 43.5 Recap - Learning Outcomes - Page 935: 1

Answer

The first yolk sac encloses the entire yolk body and is formed in the 5-day embryo. The mesoderm and ectoderm term layers extend beyond the embryo to make the chorion and the amnion, which form the amniotic cavity. The chorion and the allantoic membrane regulate gas exchange between the embryo and its environment. The allantois stores the waste products from the embryo.

Work Step by Step

The first yolk sac encloses the entire yolk body and is formed in the 5-day embryo. The mesoderm and ectoderm term layers extend beyond the embryo to make the chorion and the amnion, which form the amniotic cavity. The chorion and the allantoic membrane regulate gas exchange between the embryo and its environment. The allantois stores the waste products from the embryo.
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