and the change in membrane potential here

这儿的膜电位改变
is so dramatic that it changes the membrane potential here,

非常剧烈甚至能改变旁边这儿的膜电位
and here, and here,

然后是这儿再是这儿
and that change of potential flows down the surface of the axon,

电位变化顺着轴突表面流动
eventually reaching this output region.

最终到达输出区域
The flow of information is really a flow of electrical potential

信息流实际上就是电势差的流动
and it goes in one direction only.

并且流动是单向性的
It goes from the region of the cell

它从这个细胞的
where the dendrites are down through the axon.

树突顺流直下流向轴突
We're going to come back and talk about the action potential

我们讲心脏工作原理时
a little bit more when we talk about how the heart works,

会回头再多讨论一点动作电位
because the heart when its contracting,

因为心脏收缩时