What Happens During a Cross-Bridge Cycle in Skeletal Muscle

question 136

Multiple Choice

What happens during a cross-bridge cycle in skeletal muscle?

• A) The cross bridge is energized as myosin ATPase activity hydrolyzes ATP.
• B) The myosin cross bridge is able to bind with 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.

---

Definitions:

Financial Gain

The increase in monetary resources or wealth, often as a result of investments, business ventures, or other economic activities.

Retaining Mates

Strategies or behaviors employed to keep a romantic partner or ensure a long-term commitment.

Parenting Offspring

The act of raising and nurturing children, encompassing physical care, emotional support, and guidance for development.

Sexual Gratification

The pleasure and satisfaction derived from sexual activities or thoughts, which can contribute to an individual's overall sense of well-being.