Essential Cell Biology, 4th Edition

Published by Garland Science
ISBN 10: 0815344546
ISBN 13: 978-0-81534-454-4

Chapter 17 - Cytoskeleton - Questions - Page 601: Question 17-22 C

Answer

True

Work Step by Step

The role of calcium in muscle contraction is accurate in the phrase "To bind to troponin, cause it to move tropomyosin, and thereby expose actin filaments to myosin heads." During muscle contraction, calcium ions bind to troponin, which causes a conformational change in the troponin-tropomyosin complex. This conformational change moves tropomyosin away from the myosin binding site on actin, exposing it to myosin heads. This allows the myosin heads to form cross-bridges with actin filaments and initiate muscle contraction. The statement is false.
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