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Actin and myosin
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.
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Actin and myosin
- 1. 100’s of freeppt’s from www.pptpoint.com library
- 2. actin and myosindr shabeel pn www.hi-dentfinishingschool.blogspot.com
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- 7. actin troponin tropomyosinmyosin binding site
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- 9. Ca 2+ Ca2+ Ca 2+ Ca 2+
- 10. Ca 2+ Ca2+ Ca 2+ Ca 2+ Calcium ions are released from the sarcolemma after stimulation from the T system
- 11. Ca 2+ Ca2+ Ca 2+ Ca 2+
- 12. Ca 2+ Ca2+ Ca 2+ Ca 2+ the calcium ions bind to the troponin and changes its shape
- 13. Ca 2+ Ca2+ Ca 2+ Ca 2+ the calcium ions bind to the troponin and changes its shape
- 14. Ca 2+ Ca2+ Ca 2+ Ca 2+
- 15. Ca 2+ Ca2+ Ca 2+ Ca 2+
- 16. Ca 2+ Ca2+ Ca 2+ Ca 2+ the troponin displaces the tropomyosin and exposes the myosin binding sites
- 17. Ca 2+ Ca2+ Ca 2+ Ca 2+
- 18. Ca 2+ Ca2+ Ca 2+ Ca 2+
- 19. Ca 2+ Ca2+ Ca 2+ Ca 2+ the bulbous heads of the myosin attach to the binding sites on the actin filaments
- 20. Ca 2+ Ca2+ Ca 2+ Ca 2+
- 21. Ca 2+ Ca2+ Ca 2+ Ca 2+
- 22. Ca 2+ Ca2+ 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+ Ca2+ 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+ Ca2+ 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+ Ca2+ 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+ Ca2+ 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+ Ca2+ 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+ Ca2+ 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+ Ca2+ 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+ Ca2+ 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+ AP 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+ AP 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+ AP 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+ AP 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+ AP 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+ AP 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+ AP i P i P i A P i P i P i A P i P i P i phosphocreatine regenerates ATP