Answer
Active transport is required to relax muscle fibers, which is not possible when an animal has died.
Work Step by Step
Rigor mortis kicks in when ATP stores are depleted in the body several hours after death.
Campbell Biology (12th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0135188741
ISBN 13:
978-0-13518-874-3
Chapter 50 - 50.5 - Concept Check - Page 1132: 2
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