which is coming down your nerve

细胞将来自于神经的
and convert it into a muscle contraction work this way,

电信号传递到细胞收缩肌中
so 'neuro' nerve, muscle junctions act

所以神经和肌肉关节运动
based on ligand-gated ion channels.

都基于配体门控离子通道
Another family is called the G-protein coupled receptor.

另一类家族叫做G蛋白偶联受体
It's called the G-protein coupled receptor because it's a receptor,

之所以叫这个名字是因为这种受体
like the one shown here,

就像这里展示的一样
that's coupled to a special molecule called a G-protein.

是与一种叫做G蛋白的特殊分子偶联的
When the ligand is present it binds to the receptor outside the cell

当配体存在并与细胞表面的受体结合时
and it activates this G-protein.

就会激活G蛋白
The G-protein then goes on

然后G蛋白在细胞内
to create some other biochemical changes inside the cell.

诱发其它的一些生化反应