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 47 - Musculoskeletal Systems - 47.3 - Muscles and Skeletal Systems Work Together - 47.3 Recap - Learning Outcomes - Page 1019: 1

Answer

The body wall around each segment of an earthworm's body has a circular muscle layer and a longitudinal muscle layer. When the circular muscles in one segment contract, it narrows and elongates. When the longitudinal muscles contract, the segment shortens and bulges outward. Alternations of these movements allow the worm to inch forward.

Work Step by Step

The body wall around each segment of an earthworm's body has a circular muscle layer and a longitudinal muscle layer. When the circular muscles in one segment contract, it narrows and elongates. When the longitudinal muscles contract, the segment shortens and bulges outward. Alternations of these movements allow the worm to inch forward.
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