Plasma membrane of ...... is known as sarcolemma.

Options

A. Myofibre
B. Myofibril
C. Muscle
D. Fascicles

Answer

To solve the question "Plasma membrane of ...... is known as sarcolemma," we need to identify which structure's plasma membrane is referred to as sarcolemma.

### Step-by-Step Solution:

1. **Understanding Sarcolemma**:
- The term "sarcolemma" specifically refers to the plasma membrane of muscle cells. It is also known as "myolemma."

2. **Identifying the Options**:
- The options provided are:
- Option 1: Myofiber
- Option 2: Myofibril
- Option 3: Muscle
- Option 4: Fascicles

3. **Analyzing Each Option**:
- **Myofiber**: This term refers to a muscle fiber, which is a single muscle cell. The plasma membrane of a myofiber is indeed called sarcolemma.
- **Myofibril**: This is a component of a muscle fiber and is not a cell itself. Therefore, it does not have a plasma membrane called sarcolemma.
- **Muscle**: This is a collective term for a group of muscle fibers. The term sarcolemma does not apply to the entire muscle but rather to individual muscle fibers.
- **Fascicles**: This refers to a bundle of muscle fibers. Like muscle, it does not have a plasma membrane called sarcolemma.

4. **Conclusion**:
- The correct answer is **Myofiber** (Option 1), as the plasma membrane of a myofiber is indeed known as sarcolemma.

### Final Answer:
The plasma membrane of **myofiber** is known as sarcolemma.