Which of the Following Happens During a Cross-Bridge Cycle in Skeletal

question 269

Multiple Choice

Which of the following happens during a cross-bridge cycle in skeletal muscle?

• A)The cross bridge is energized as myosin and ATPase activity hydrolyzes ATP.
• B)The myosin cross bridge is able to bind with a troponin molecule when Ca²⁺ pulls the troponin-tropomyosin complex aside.
• C) The linkage between actin and the myosin cross bridge is broken at the end of the cross-bridge cycle as Mg²⁺ binds to the cross bridge.
• D) The power strokes of all cross bridges are directed toward the periphery of the thick filament.

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