Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 9 - Assess - Page 194: 2



Work Step by Step

The lumen is the open space within hollow organs or vessels; in the digestive tract, the lumen is surrounded by four layers of tissue. The serosa, mucosa, and muscularis are layers of different types of tissues that surround the lumen.
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