Myosin Filament Adventure
By guylivy, Updated
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You will never believe what happen to me..nerves starting sending signals that stimulated muscles. Then calcium was released and then it binds to the tropin and that uncovered the myosin binding site. The myosin heads started to attach to the the actin, and that formed the cross bridge!
What???? That's crazy. What else happened?
That's not all.. the myosin head moved toward the center of the sarcomere and then phosphate was released. The myosin head moved, causing the actin filament to move toward the center of the sarcomere.
That sounds so cool!
Afer that, new molecules of ATP attached to the myosin head, the heads detached and formed actin. The ATP broke and returned to the crocked position the myosin heads were originally in... The actin filaments moved toward the middle and the sarcomere shortened. Then the muscles relaxed and Z-disks slid back to original state.
I had no idea that's what actually happen during a muscle contraction.
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