Smooth or visceral muscle fibres are not

Options

A. Unbranched
B. Syncytial
C. Spindle shaped
D. Uninucleated

Answer

To answer the question regarding the properties of smooth or visceral muscle fibers, let's analyze the options step by step.

### Step-by-Step Solution:

1. **Understanding Smooth Muscle Fibers**:
- Smooth muscle fibers, also known as visceral muscles, are found in the walls of internal organs (except the heart). They are called "smooth" because they do not have the striations seen in skeletal muscle.

2. **Identifying Characteristics of Smooth Muscle**:
- **Unbranched**: Smooth muscle fibers are indeed unbranched. This means that they do not have branches like cardiac muscle fibers.
- **Spindle-shaped**: Smooth muscle fibers are spindle-shaped and elongated with tapered ends.
- **Uninucleate**: Each smooth muscle fiber contains a single nucleus, which is centrally located.

3. **Evaluating the Options**:
- **Option 1: Unbranched**: This is incorrect because smooth muscles are unbranched.
- **Option 2: Syncytial**: This is correct. Smooth muscle fibers are not syncytial, meaning they do not have multiple nuclei. This characteristic is typical of skeletal muscle fibers, which are multinucleate.
- **Option 3: Spindle-shaped**: This is incorrect because smooth muscle fibers are indeed spindle-shaped.
- **Option 4: Uninucleate**: This is also incorrect because smooth muscle fibers are uninucleate.

4. **Conclusion**:
- The only characteristic that is not present in smooth or visceral muscle fibers is that they are not syncytial. Therefore, the answer is that smooth or visceral muscle fibers are not syncytial.

### Final Answer:
Smooth or visceral muscle fibers are not syncytial.

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