During the cross‑bridge cycle, what describes the power stroke?

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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

During the cross‑bridge cycle, what describes the power stroke?

Explanation:
The power stroke is the lever-arm motion of the myosin head as it pivots while bound to actin, pulling the actin filament toward the center of the sarcomere. This rotation converts the chemical energy stored in the cocked myosin head (from ATP hydrolysis) into mechanical work, shortening the sarcomere. It happens after the myosin head forms a cross-bridge with actin and releases Pi, setting the stage for sliding the thin filament. ATP binding later causes the myosin head to detach and reset for another cycle.

The power stroke is the lever-arm motion of the myosin head as it pivots while bound to actin, pulling the actin filament toward the center of the sarcomere. This rotation converts the chemical energy stored in the cocked myosin head (from ATP hydrolysis) into mechanical work, shortening the sarcomere. It happens after the myosin head forms a cross-bridge with actin and releases Pi, setting the stage for sliding the thin filament. ATP binding later causes the myosin head to detach and reset for another cycle.

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