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b. ATP is split and the myosin head cocks. c. The myosin head unbinds from actin. d. The myosin head has a power stroke, pulling the actin filament. Sequence: _Op d e Challenge Questions 28. Describe the fuel sources and primary pathway of ATP synthesis used for each of the following activities: a, the first ten seconds of a 100-meter sprint, b, bench pressing 250 pounds for 30 seconds, and c. the second mile of a light jog around the block 232 STUDY GUIDE – Principles of Human Physiology

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