Smooth or visceral muscle fibres are not

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding Smooth Muscle Fibers**: Smooth or visceral muscle fibers are a type of non-striated muscle found in various organs. They are distinct from skeletal and cardiac muscle fibers.

2. **Analyzing the Options**:
- **Option 1: Unbranched**: Smooth muscle fibers are indeed unbranched. They are long and tapered at both ends, resembling a spindle shape.
- **Option 2: Syncytial**: Syncytial refers to a structure that has multiple nuclei within a single cell. Smooth muscle fibers are not syncytial; they typically have a single nucleus.
- **Option 3: Spindle Shaped**: The shape of smooth muscle fibers is spindle-shaped, which means they are elongated and taper at both ends.
- **Option 4: Uninucleated**: Smooth muscle fibers are uninucleated, meaning they contain one nucleus per cell.

3. **Identifying the Correct Answer**: The question asks what smooth or visceral muscle fibers are not. Since they are not syncytial (having multiple nuclei), the correct answer is **syncytial**.

4. **Conclusion**: Smooth or visceral muscle fibers are not syncytial, as they have a single nucleus and are unbranched and spindle-shaped.