Muscular system

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