The document summarizes the process of muscle contraction via actin and myosin. Calcium ions are released which bind to troponin, displacing tropomyosin and exposing myosin binding sites on actin filaments. Myosin heads attach and change position to slide actin filaments, then detach when ATP binds. Hydrolysis of ATP provides energy to detach myosin heads, and calcium is reabsorbed allowing tropomyosin to reblock binding sites.
22. Ca 2+ Ca 2+ Ca 2+ Ca 2+ the myosin heads change position to achieve a lower energy state and slide the actin filaments past the stationary myosin
23. Ca 2+ Ca 2+ Ca 2+ Ca 2+ A P i P i P i A P i P i P i A P i P i P i
24. Ca 2+ Ca 2+ Ca 2+ Ca 2+ A P i P i P i A P i P i P i A P i P i P i
25. Ca 2+ Ca 2+ Ca 2+ Ca 2+ ATP binds to the bulbous heads and causes it to become detached A P i P i P i A P i P i P i A P i P i P i
26. Ca 2+ Ca 2+ Ca 2+ Ca 2+ ATP binds to the bulbous heads and causes it to become detached A P i P i P i A P i P i P i A P i P i P i
27. Ca 2+ Ca 2+ Ca 2+ Ca 2+ A P i P i P i A P i P i P i A P i P i P i hydrolysis of ATP provides the energy to “re-cock” the heads
28. Ca 2+ Ca 2+ Ca 2+ Ca 2+ A P i P i P i A P i P i P i A P i P i P i hydrolysis of ATP provides the energy to “re-cock” the heads
29. Ca 2+ Ca 2+ Ca 2+ Ca 2+ A P i P i P i A P i P i P i A P i P i P i
30. Ca 2+ Ca 2+ Ca 2+ Ca 2+ A P i P i P i A P i P i P i A P i P i P i calcium ions are re-absorbed back into the T system
31. Ca 2+ A P i P i P i A P i P i P i A P i P i P i calcium ions are re-absorbed back into the T system
32. Ca 2+ A P i P i P i A P i P i P i A P i P i P i the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites
33. Ca 2+ A P i P i P i A P i P i P i A P i P i P i the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites
34. Ca 2+ A P i P i P i A P i P i P i A P i P i P i the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites
35. Ca 2+ A P i P i P i A P i P i P i A P i P i P i phosphocreatine regenerates ATP
36. Ca 2+ A P i P i P i A P i P i P i A P i P i P i phosphocreatine regenerates ATP
37. Ca 2+ A P i P i P i A P i P i P i A P i P i P i phosphocreatine regenerates ATP