Biology · Human Physiology - Muscle Contraction
During a single complete cross-bridge cycle, which sequence correctly describes the state of the myosin head?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1None of the above
- 2ATP binds → myosin binds actin → ATP hydrolysis drives power stroke → ADP released → detaches
- 3High energy (ADP+Pi bound) → binds actin → power stroke → ADP+Pi released → ATP binds → detaches → re-cocks✓
- 4Low energy → binds actin → power stroke → ATP binds → detaches → re-cocks to high energy
Correct answer
High energy (ADP+Pi bound) → binds actin → power stroke → ADP+Pi released → ATP binds → detaches → re-cocks
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