Rigor mortis, a condition in which skeletal muscles temporarily remain in a rigid state of partial contraction due to the absence of ATP, occurs a few hours after death. Which of the following steps is NOT necessary for muscle relaxation?
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Correct Answer: C. The detachment of the troponin-tropomyosin complex from actin.
Choices A, B, and D are all necessary for a muscle cell to return to its resting state. The troponin-tropomyosin complex must return to its original position on actin (the position it occupied before calcium was released from the sarcoplasmic reticulum). When the complex detaches, muscle contraction occurs.
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