List two structural differences between striated and unstriated muscle fibres.

Explanation

### Step-by-Step Solution:

1. **Definition of Muscle Fibers**:
- Muscle fibers are categorized into two main types: striated (skeletal and cardiac) and unstriated (smooth) muscle fibers.

2. **Structural Difference 1: Nuclei**:
- **Striated Muscle Fibers**: These fibers are multi-nucleate, meaning they contain more than one nucleus per fiber. This is important for their function and repair.
- **Unstriated Muscle Fibers**: In contrast, unstriated muscle fibers are typically uni-nucleate, having only one nucleus per fiber.
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