Across
- 4. chemical released by nerve cells
- 7. groups of specialized cells that are similar in structure and perform common functions
- 10. break down ATP quickly, contract quickly
- 14. multiple layers of cells (strata)
- 15. requires conscious control over activity
- 16. single layer of cells
- 17. produce blood cells
Down
- 1. covers entire outer surface of muscle
- 2. contractile protein filament (thin)
- 3. break down ATP slowly, contract slow
- 5. attaches muscle to bone
- 6. functions without conscious thought or stimulation by nerves
- 8. only connective tissue that doesn't have matrix
- 9. primarily fat utilized for energy
- 11. stimulate contraction of skeletal muscle cells
- 12. smallest unit of muscle that can contract
- 13. attach bone to bone
- 18. contractile protein filament (thick)