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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!!
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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