The contractie element present in the myofibril of a striated muscle between two successive Z-lines is called

Options

A. 1. Sarcosome
B. 2, Sarcoplasm
C. 3. Sarcomere
D. 4. Sarcoplasmic reticulum

Answer

To answer the question regarding the contractile element present in the myofibril of a striated muscle between two successive Z-lines, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Myofibrils**:
- Myofibrils are the basic rod-like structures found in muscle cells. They are composed of repeating units that are essential for muscle contraction.

2. **Identify Key Components**:
- Within the myofibril, there are specific structures such as Z-lines and bands. The Z-line is a crucial part of the myofibril structure.

3. **Locate the Z-lines**:
- Z-lines are the boundaries that define the start and end of a contractile unit. They appear as dark lines in the striated muscle.

4. **Define the Contractile Unit**:
- The area between two successive Z-lines is where the actual contraction occurs. This segment is responsible for the muscle's ability to contract and is crucial for muscle function.

5. **Name the Contractile Element**:
- The segment of the myofibril between two Z-lines is called a **sarcomere**. The sarcomere is the fundamental unit of muscle contraction.

6. **Conclusion**:
- Therefore, the contractile element present in the myofibril of a striated muscle between two successive Z-lines is called the **sarcomere**.

### Final Answer:
The contractile element present in the myofibril of a striated muscle between two successive Z-lines is called the **sarcomere**.

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