Across
- 2. push or pull
- 4. long, threadlike muscle cells
- 6. muscle cells
- 8. shortening of muscle fibers
- 12. cells that have a nucleus and membrane bound organelles
- 13. cell tissues that contract to produce movement
- 14. thick filaments
Down
- 1. control center of eukaryotic cells
- 3. organelle that produces ATP
- 5. thin filaments
- 6. structures inside muscles cells made of actin and myosin
- 7. cells that do not have a nucleus or membrane bound organelles
- 8. the basic structural and functional units of life
- 9. ion that triggers muscle contraction
- 10. change in position produced by muscles contracting
- 11. bundle of neurons that carry electrical signals throughout the body