Capillaries are not muscular

毛细血管并非肌性血管
but they're able to transport nutrients and molecules.

但它也能运输养料和分子
What's happened as we've gone from the aorta, a single vessel,

在血液由主动脉这根单独的血管
down to a capillary bed and there are

流入广布于体内的动脉血管床的过程中
many, many capillary beds in your body.

到底发生了什么呢
Well, if I could take a cross-section at any point--

如果取任意一个位置的横截面
a cross-section of this--

这个位置的横截面
then the total flow rate into all the capillaries,

那么进入到毛细血管中的总流速
the total flow rate through all the capillaries has to be the same

流经所有毛细血管的总流速就等于
as the flow rate through the aorta.

流经主动脉的血液流速
By this process of branching

在血液分流的过程中
where this total flow of 5L/min gets divided,

五升每分钟的流速不停地被分流