and that because they're arterioles

真是由于他们是小动脉
they can constrict or reduce their diameters and expand,

他们能够收缩或缩小直径以及扩张
dilate or expand their diameters.

缩小或扩大它们的直径
Because of this, if it constricts then the pressure

由于这一点如果它收缩那么压强下降
drop over that length of arteriole is going to change.

会导致小动脉的长度发生变化
Having these two adjustable resistances on both sides of the glomerulus

这两股在肾小球两侧的可调节阻力
allows each nephron to regulate what the pressure is in the fluid

使得每一个肾单位能够调控液体在肾小球
inside the capillaries of the glomerulus.

的毛细血管中的压强
Now, since its pressure inside these capillaries

既然毛细血管中的压强是
which is the driving force for filtration,

过滤发生的动力
that means that each nephron has the

这意味着每一个肾单位都有着
ability to adjust how much is filtered in each glomerulus.

调节肾小球中过滤量的能力