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Storyboard Text

  • Hi, Im a Myosin Filament and today i'm going to explain to you what happens to me during a muscle contraction.
  • I can make your muscles contract by pulling thin filaments over the thicker ones, which then pulls Z-Disks closer.
  • That's so cool!!
  • Whats next?
  • It all starts when calcium is released from the sarcoplasmic reticulum. It then goes and binds with the troponin.
  • My myosin heads will attach to the actin, which will the create a crossbridge. I then pull on the actin for a powerstoke which will help me move top the center of the sarcomere.
  • OMG that's a lot. Are you almost finished.
  • After my powerstroke the ATP is broken down. Calcium ions are then transported back to the sarcoplasmic reticulum.
  • Yes, The last parts of my journey in muscle contraction is, the troponin- tropomyosin complex will cover my myosin heads and the muscle will finally relax.
  • You are a very busy person. And very important. It must be really cool to be part of muscle contraction
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