Muscular system
Across
- 2. remaining portion of thin filaments do not project into A band
- 4. proteins that span the gap between the laterals and the transverse tubules
- 6. sliding filament mechanism
- 8. unstriated and involuntary
- 11. lighter area middle of A band
- 12. enlarged regions of the sarcoplasmic reticulum
- 14. motor neuron and of the muscle fibers in innervates
- 16. single skeletal muscle cell
- 18. thick filament of myofibril
- 19. muscle attached to bone
- 22. protein that is composed of subunits that bind to actin Ca++ and tropomyosin
- 23. type of filament organized into elongated fibers
- 24. striated and involuntary
- 25. myosin cross bridge binds to actin molecules
Down
- 1. contractile elements composed of sarcomere
- 3. cross bridge detaches at end of power stroke and returns to the original conformation
- 5. the increase in tension of accompanying repetitive stimulation of fiber
- 7. smallest unit of muscle cell
- 9. type of filament arranged in double helical strand
- 10. regulates smooth muscle but not striated
- 13. cross bridge bends, plus thin mmyofilamentinward
- 15. threadlike filamentous protein formed by actin helix
- 17. defines boundary of sarcomere
- 20. thin filament of myofibril
- 21. made up of thick filaments and thin filaments overlap