Under a resting condition

在静息状态下
they have a population of channels

一部分的通道是持续开放的
that's always allowing sodium and potassium to flow,

任由钠钾离子进出
that creates the potential.

从而形成静息电位
Then,they have special channels that open

一旦电压改变
when the voltage is disturbed in some way.

特殊通道就打开
Here,we're looking at a trace of membrane potential in time.

我们再来实时追踪一下膜电位
Imagine that you're very small

假想一下你很小
and you're sitting on the surface of this membrane

你就坐在细胞膜的表面
but you have special shoes on that measure the voltage or something.

你有一双很特别的鞋可以检测电压
You can experience the voltage,

你可以感受到电压
the potential drop across the membrane

跨膜的电位差