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2. actin

3. troponin actin

4. tropomyosin troponin actin

5. tropomyosin troponin actin

6. myosin binding site tropomyosin troponin actin

8. Ca2+ Ca2+ Ca2+ Ca2+

9. Ca2+ Ca2+ Ca2+ Ca2+ Calcium ions are released from the sarcolemma after stimulation from the T system

10. Ca2+ Ca2+ Ca2+ Ca2+

11. Ca2+ Ca2+ Ca2+ Ca2+ the calcium ions bind to the troponin and changes its shape

12. Ca2+ Ca2+ Ca2+ Ca2+ the calcium ions bind to the troponin and changes its shape

13. Ca2+ Ca2+ Ca2+ Ca2+

14. Ca2+ Ca2+ Ca2+ Ca2+

15. Ca2+ Ca2+ Ca2+ Ca2+ the troponin displaces the tropomyosin and exposes the myosin binding sites

16. Ca2+ Ca2+ Ca2+ Ca2+

17. Ca2+ Ca2+ Ca2+ Ca2+

18. Ca2+ Ca2+ Ca2+ Ca2+ the bulbous heads of the myosin attach to the binding sites on the actin filaments

19. Ca2+ Ca2+ Ca2+ Ca2+

20. Ca2+ Ca2+ Ca2+ Ca2+

21. Ca2+ Ca2+ Ca2+ Ca2+ the myosin heads change position to achieve a lower energy state and slide the actin filaments past the stationary myosin

22. Pi Pi Pi Pi Pi Pi Pi Pi Pi A A A Ca2+ Ca2+ Ca2+ Ca2+

23. Pi Pi Pi Pi Pi Pi Pi Pi Pi A A A Ca2+ Ca2+ Ca2+ Ca2+

24. Pi Pi Pi Pi Pi Pi Pi Pi Pi A A A Ca2+ Ca2+ Ca2+ Ca2+ ATP binds to the bulbous heads and causes it to become detached

25. Pi Pi Pi Pi Pi Pi Pi Pi Pi A A A Ca2+ Ca2+ Ca2+ Ca2+ ATP binds to the bulbous heads and causes it to become detached

26. Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ Ca2+ Ca2+ Ca2+ hydrolysis of ATP provides the energy to “re-cock” the heads

27. Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ Ca2+ Ca2+ Ca2+ hydrolysis of ATP provides the energy to “re-cock” the heads

28. Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ Ca2+ Ca2+ Ca2+

29. Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ Ca2+ Ca2+ Ca2+ calcium ions are re-absorbed back into the T system

30. Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ calcium ions are re-absorbed back into the T system

31. Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites

32. Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites

33. Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites

34. Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ phosphocreatine regenerates ATP

35. Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ phosphocreatine regenerates ATP

36. Pi Pi Pi A Pi Pi Pi A Pi Pi Pi A Ca2+ phosphocreatine regenerates ATP