Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 50 - Test Your Understanding - Level 3 - Synthesis/Evaluation - Page 1132: 9

Answer

Paramyosin may replace myosin on thick fibers in such a way that either maintains contraction as Ca+ levels fall or are not susceptible to tropomyosin blockage.

Work Step by Step

You could test this hypothesis by altering, in a controlled environment, the Ca+ and tropomyosin concentrations around muscle fibers to see how they are affected. In shellfish that have paramyosin, it does indeed alter the thick fibers in this mechanism.
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