Campbell Biology (12th Edition)

Published by Pearson
ISBN 10: 0135188741
ISBN 13: 978-0-13518-874-3

Chapter 50 - 50.5 - Concept Check - Page 1132: 1

Answer

In skeletal muscles, calcium ions bind to troponin on thin filaments. In smooth muscles, calcium ions bind to calmodulin within the cells.

Work Step by Step

The fiber structures are organized differently in skeletal and smooth muscle, necessitating different activation pathways.
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