through the proximal convoluted tubule

通过近曲小管
and then through the Loop of Henle,

和亨利氏环
and the distal convoluted tubule, and eventually the collecting duct,

以及远曲小管流动最后进入集合管
and as we know from last time, several things can happen.

据上次的了解很多作用会发生
One is that molecules within this fluid can be reabsorbed,

其中之一是液体中的分子会被重吸收
and if they're reabsorbed they move out of the tubular system

并且如果它们被重吸收了就会被
and into-- back into blood.

从管道系统中移除并回到血液中
That's why there are blood vessels surrounding

这就是所有肾脏中的肾单位
all the nephrons in the kidneys,

都包绕着血管的原因
so that there's a blood flow that's ready to catch these molecules

以便有一股血流能够随时准备去接收
as they're reabsorbed from the tubules.

这些被小管重吸收的分子
We also mentioned that there are some special processes of secretion

我们也提到过一些特殊的排泌过程