Functional unit of skeletal muscle is called

Options

A. Sarcolemma
B. Z-band
C. Sarcomere
D. Sarcoplasm

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the functional unit of skeletal muscle. This means we need to identify the smallest structural unit that is responsible for the contraction and function of skeletal muscles.

2. **Analyzing the Options**:
- **Sarcolemma**: This is the cell membrane of muscle fibers. It is not the functional unit but rather a covering.
- **Z-band**: This is part of the muscle fiber structure but does not represent the entire functional unit.
- **Sarcoplasmic Reticulum**: This is involved in storing calcium ions and is part of the muscle fiber but is not the functional unit itself.
- **Sarcomere**: This is the basic contractile unit of muscle tissue. It is defined as the segment between two Z-lines and is responsible for muscle contraction.

3. **Identifying the Correct Answer**: Among the options provided, the sarcomere is the only one that fits the definition of the functional unit of skeletal muscle. It is where the actual contraction occurs due to the interaction of actin and myosin filaments.

4. **Conclusion**: Therefore, the functional unit of skeletal muscle is called the **sarcomere**.

**Final Answer**: The functional unit of skeletal muscle is called the **sarcomere**.

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