**Core Concept**
The sarcomere is the functional unit of striated muscle tissue, and its cross-bridges play a crucial role in the contraction mechanism of skeletal muscle. The cross-bridges are formed by the interaction between actin and myosin filaments.

**Why the Correct Answer is Right**
The correct answer involves the structure and function of the sarcomere. The cross-bridges are formed by the myosin heads binding to the actin filaments, allowing for the sliding filament mechanism and muscle contraction. This process is regulated by the troponin-tropomyosin complex, which controls the exposure of the myosin binding sites on the actin filaments.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a correct component of the sarcomere.
* **Option B:** This is not directly related to the structure or function of the sarcomere.
* **Option D:** This is not a component of the sarcomere.

**Clinical Pearl / High-Yield Fact**
The sliding filament theory explains the mechanism of muscle contraction, which is essential for understanding various muscle disorders and conditions.

**Correct Answer:** C. Myosin filaments.