Human Anatomy & Physiology (9th Edition)

Published by Pearson
ISBN 10: 0321743261
ISBN 13: 978-0-32174-326-8

Chapter 28 - Pregnancy and Human Development - Review Questions - Page 1093: 4



Work Step by Step

The trophoblast start off as cells that start to form the outer layer of the blastocyst. This occurs about five days after fertilization and it attaches itself to the uterus. It comes together with the uterus to form a large of the placenta as well which is necessary for embryonic development by providing the nutrients needed to grow.
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.