After detachment, what energizes the myosin head for the next cycle?

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Study for the Anatomy and Physiology Muscular System Test. Prepare with flashcards and multiple choice questions; each question provides hints and explanations. Get ready to excel in your exam!

Multiple Choice

After detachment, what energizes the myosin head for the next cycle?

Explanation:
The energy comes from ATP hydrolysis. After detachment, the myosin head binds ATP and then hydrolyzes it to ADP and inorganic phosphate, which re-cocks the head into a high-energy, primed conformation. This energized state allows the head to form a new cross-bridge with actin, enabling the next contraction cycle once Pi is released and the power stroke occurs.

The energy comes from ATP hydrolysis. After detachment, the myosin head binds ATP and then hydrolyzes it to ADP and inorganic phosphate, which re-cocks the head into a high-energy, primed conformation. This energized state allows the head to form a new cross-bridge with actin, enabling the next contraction cycle once Pi is released and the power stroke occurs.

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