Because, remember, the relaxation period of a twitch is when all the calcium is being pumped back into the sarcoplasmic reticulum.

因为，记住，抽搐的放松期是所有的钙都被泵入肌浆网的时候。

But soon the fiber slides back down into the relaxation period, when the calcium gets pumped back into the sarcoplasmic reticulum, and the actin and myosin stop the binding cycle, and the muscle relaxes.

但很快，纤维滑回松弛期，此时钙被泵入肌浆网，肌动蛋白和肌球蛋白停止结合循环，肌肉放松。