Which yield ATP during muscle contraction?

Options

A. Oxygen
B. Myoglobin
C. Cholesterol
D. Creatine phosphate

Answer

To determine which yields ATP during muscle contraction, we can analyze the options provided and understand the role of different compounds in muscle energy metabolism.

### Step-by-Step Solution:

1. **Understanding Muscle Contraction**: Muscle contraction requires energy, which is primarily derived from ATP (adenosine triphosphate). The actomyosin complex, essential for muscle contraction, relies on ATP for its formation and function.

2. **Evaluating the Options**:
- **Oxygen**: While oxygen is crucial for cellular respiration and energy production, it does not directly yield ATP. Instead, it facilitates the breakdown of glucose into carbon dioxide and water, releasing energy in the process. Therefore, oxygen is not the correct answer.

- **Myoglobin**: Myoglobin is an oxygen-storing pigment in muscles, similar to hemoglobin in blood. It helps in storing oxygen for muscle use but does not yield ATP. Thus, myoglobin is also not the correct answer.

- **Cholesterol**: Cholesterol is a type of lipid that plays various roles in the body, but it does not directly contribute to ATP production during muscle contraction. Therefore, cholesterol is not the correct answer.

- **Creatine Phosphate**: This compound is crucial for energy storage in muscles. Creatine phosphate can donate a phosphate group to ADP (adenosine diphosphate) to regenerate ATP during muscle activity. This process occurs when the muscle is active, making creatine phosphate the correct answer.

3. **Conclusion**: The correct answer to the question of which yields ATP during muscle contraction is **creatine phosphate**. It serves as a rapid source of energy by converting ADP back into ATP when muscles are active.

### Final Answer:
**Creatine Phosphate yields ATP during muscle contraction.**

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