来自《耶鲁大学开放课程：生物医学工程探索 第17集 第17集》

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  That sodium concentration drops as you move through the proximal tubule
  钠的浓度随着在近曲小管中前进会下降
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  so a lot of that sodium is reabsorbed,
  因此大量钠被重吸收
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  about two-thirds of it is reabsorbed in the proximal tubule.
  约有三分之二的钠在近曲小管中被重吸收
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  Then, if I looked over the Loop of Henle in the descending loop,
  然后 如果看亨利氏环的降支
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  the loop that goes down, actually sodium molecules come back in,
  就是向下走的环 事实上钠离子
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  and then sodium molecules go back out in the ascending loop.
  会从这里回来 再从升支出去
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  This has to do with the establishment of gradients of sodium
  这和我前面提到过的
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  that I mentioned before in the interstitial space which allows the
  细胞间隙的钠浓度梯度的建立有关
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  kidney to--this represents those-- the sodium
  它允许肾脏 这个代表了这些 被利用来
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  that's used to create those gradients,
  产生这些梯度的钠
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  those gradients are used for water absorption.
  这些梯度被用于水的重吸收
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  Then, most of the rest of the kidney is--
  然后 绝大部分剩余的肾脏