Across
- 4. Thick filament
- 5. Membrane that surrounds each muscle
- 8. Cells that are excitable
- 10. Not controlled movement
- 11. Main tissue of the heart
- 13. contains mitochondria
- 14. Attach to muscle and bone
- 15. single muscle cell
- 17. "peacemaker" cells
- 18. Fibers within the muscles
- 20. connect the cells
Down
- 1. Functional unit inside a muscle fiber
- 2. Membrane that surrounds the muscle cell
- 3. Diseases of the muscles
- 6. controlled movement
- 7. Thin filament
- 9. Plasma membrane of the muscles
- 12. able to shorten and pull
- 16. Membrane that surrounds fascicles
- 19. Fibers that are organized into bundles