What is the term for resetting the myosin head to the high‑energy state powered by ATP hydrolysis?

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Study for the Ivy Tech APHY 101 Muscle System Test. Dive into comprehensive questions with clear hints and explanations, boosting your confidence for the exam!

Multiple Choice

What is the term for resetting the myosin head to the high‑energy state powered by ATP hydrolysis?

Explanation:
The term is cocking (resetting) of the myosin head. After ATP binds and is hydrolyzed to ADP and Pi, energy is stored and the myosin head is repositioned into a high-energy, cocked configuration ready to attach to actin. This prepares the head for the subsequent power stroke that actually pulls the filament. The power stroke itself is the forceful movement following Pi release, detachment occurs later when a new ATP binds to myosin, and calcium release helps expose binding sites to allow attachment but does not reset the head.

The term is cocking (resetting) of the myosin head. After ATP binds and is hydrolyzed to ADP and Pi, energy is stored and the myosin head is repositioned into a high-energy, cocked configuration ready to attach to actin. This prepares the head for the subsequent power stroke that actually pulls the filament. The power stroke itself is the forceful movement following Pi release, detachment occurs later when a new ATP binds to myosin, and calcium release helps expose binding sites to allow attachment but does not reset the head.

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