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: 2

Answer

The trophoblast is the first extraembryonic membrane to form in mammals. Trophoblastic cells begin the process of implantation by secreting proteolytic enzymes and burrowing into the endometrium.

Work Step by Step

The trophoblast is the first extraembryonic membrane to form in mammals. Trophoblastic cells begin the process of implantation by secreting proteolytic enzymes and burrowing into the endometrium.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.

GradeSaver will pay $15 for your literature essays
GradeSaver will pay $25 for your college application essays
GradeSaver will pay $50 for your graduate school essays – Law, Business, or Medical
GradeSaver will pay $10 for your Community Note contributions
GradeSaver will pay $500 for your Textbook Answer contributions