ATP provides energy of muscle contraction by allowing for

Options

A. Cross-bridge attachment of myosin to actin
B. Cross-bridge datachment of myosin from actin
C. An actin potential formation in the muscle cell
D. Release of `Ca^(+)` from sarcoplasmic reticulum

Answer

**Step-by-Step Solution:**

1. **Understanding Muscle Contraction**: Muscle contraction occurs through the sliding filament model, where actin and myosin filaments slide over each other to shorten the muscle fiber.

2. **Role of ATP**: ATP (adenosine triphosphate) is the primary energy currency in cells. During muscle contraction, ATP is essential for providing the energy needed for various processes.

3. **ATP Breakdown**: ATP breaks down into ADP (adenosine diphosphate) and inorganic phosphate (Pi). This breakdown is an exothermic reaction, meaning it releases energy.

4. **Energy Utilization**: The energy released from the breakdown of ATP is used by the myosin heads. Specifically, this energy allows the myosin heads to detach from the actin filaments after they have formed a cross-bridge.

5. **Cross-Bridge Cycle**:
- When a muscle contracts, myosin heads attach to actin filaments, forming cross-bridges.
- The power stroke occurs, pulling actin filaments inward.
- After the power stroke, ATP binds to myosin, causing the myosin head to detach from actin.

6. **Conclusion**: Therefore, ATP provides energy for muscle contraction by allowing for the cross-bridge detachment of myosin from actin.

**Final Answer**: ATP provides energy of muscle contraction by allowing for cross-bridge detachment of myosin from actin.

---