2. actin

3. troponin

4. actin troponin tropomyosin

5. actin troponin tropomyosin

6. actin troponin tropomyosin myosin binding site

8. Ca 2+

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

10. Ca 2+

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

12. Ca 2+ the calcium ions bind to the troponin and changes its shape

13. Ca 2+

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

16. Ca 2+

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

19. Ca 2+

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

22. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi

23. APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi

24. APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi ATP binds to the bulbous heads and causes it to become detached

25. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi ATP binds to the bulbous heads and causes it to become detached

26. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi hydrolysis of ATP provides the energy to “re-cock” the heads

27. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi hydrolysis of ATP provides the energy to “re-cock” the heads

28. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi

29. APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi calcium ions are re-absorbed back into the T system

30. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi calcium ions are re-absorbed back into the T system

31. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites

32. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites

33. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites

34. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi phosphocreatine regenerates ATP

35. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi phosphocreatine regenerates ATP

36. Ca 2+ APiPi PiPi PiPi APiPi PiPi PiPi APiPi PiPi PiPi phosphocreatine regenerates ATP

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