Across
- 3. Lighter-coloured region where myosin and actin don't overlap
- 5. Forms fibrous strand around actin filament
- 6. Darker-coloured region where myosin and actin overlap
- 7. Fibres that have slower, weaker but longer lasting effects
- 11. Long rod-shaped fibres wioth projecting bulbous heads
- 12. line in the centre of the I band
Down
- 1. Two strands twisted around each other
- 2. Fibres that have quicker, stronger but shorter lasting effects
- 4. Tiny muscle fibres
- 7. Cytoplasm of muscle fibres full of mitochondria and ER
- 8. Globular protein involved in muscle contraction
- 9. The distance between two adjacent Z lines
- 10. Lighter-coloured region at the centre of the A band