青云翻译

This occurs when the nervous system signals to the body muscle tissue, and this is how it works.

When you nervous system signals the body muscles, this phenomenon occurs, this is how it works.

When the nervous system sends out the signal to the body muscular tissue, this kind of phenomenon can occur, this also is its principle of work.

When muscle tissue from the body nervous system sends a signal, it will happen, this is it works.

When you nervous system signals the body muscles, this phenomenon occurs, this is how it works.