………………. bands of muscle fibres are made up of protein myosin, while........... bands are composed of actin .

Explanation

**Step-by-Step Solution:**

1. **Identify the Types of Muscle Fibers:**
- Muscle fibers are primarily composed of two types of protein filaments: myosin and actin.

2. **Understand the Structure of Muscle Bands:**
- In muscle tissue, there are two main types of bands: dark bands and light bands.
- The dark bands are known as **A bands**, which are primarily made up of myosin.
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