Across
- 5. single muscle cell
- 8. pacemaker cells
- 9. where a nerve and muscle fiber come together
- 10. also known as the heart muscle
- 11. connect cells and allow them to contract
- 13. fibers are organized into bundles called a
- 14. gap between the neuron and motor end plate
- 15. part of the fiber that contains actin and myosin
- 20. heart muscle cells
- 21. thick/dark filament
- 23. a muscle that is not under conscious control
- 24. A muscle under conscious control
Down
- 1. enzyme that breaks down ACH
- 2. an example of a voluntary muscle
- 3. another name for skeletal muscle
- 4. found in the walls of hollow organs
- 6. where neurotransmitters are stored
- 7. the plasma membrane of muscle cells
- 12. a collection of collagen fibers attached to a bone
- 16. each muscle is surrounded by a membrane called the
- 17. where thick and thin filaments overlap
- 18. these cells contain mitochondria
- 19. thin/light filament
- 22. boundary between the sarcomeres
- 25. energy source of muscle contractions