Sarcomere is distance between

Options

A. Z-line to Z-line
B. Two I bands
C. Two A bands
D. Two surfaces of a Z- line

Answer

**Step-by-Step Solution:**

1. **Understanding Sarcomere**: A sarcomere is the basic structural and functional unit of striated muscle tissue. It is important to identify what constitutes a sarcomere.

2. **Identifying the Boundaries**: The sarcomere is defined by its boundaries, which are the Z lines (or Z discs). Each sarcomere extends from one Z line to the next Z line.

3. **Analyzing the Options**: The question provides four options regarding what the sarcomere distance is between:
- Option 1: Z line to Z line
- Option 2: 2 Y bands
- Option 3: 2 A bands
- Option 4: 2 surfaces of the Z line

4. **Selecting the Correct Option**: Based on the definition, the correct choice is the distance between the Z lines. Therefore, the correct answer is **Option 1: Z line to Z line**.

5. **Conclusion**: The sarcomere is the segment of muscle fiber that lies between two Z lines, and this structure is crucial for muscle contraction and the overall functionality of skeletal muscles.

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