in that it's showing these functions as sort of centralized in the core,

图上显示这些功能都围绕着一个核心
and of course that's not how your body is organized.

当然这绝不是人体的组织形式
It's not that all these layers are

不是所有功能
wrapped around the nervous system and the endocrine system.

都围绕着神经系统和内分泌系统展开的
These systems are dispersed

这些系统分布于人体各处
throughout your body and their dispersal is important,

而这种分散性很重要
and so we'll talk about that as well.

我们也会讲到这一点
Take a step way back and think about

现在让我们回过头来思考
what's the basic mechanism by which cells receive signals.

细胞接收信号的基本原理
It turns out that cells receive signals or

研究证明细胞内有很多
information from the rest of the body in a variety of ways,

接收体内其他部位信号或者信息的方式
but there's one way in particular that's a very useful way

但有一种特定的方法十分有用