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: [[Dialysis]] is used when a person's [[kidney]]s fail to remove [[urea]].
: In [[dialysis]] the [[blood]] is pumped out of the body through a tube with a [[permeable]] [[membrane]]. Surrounding that tube is a [[fluid]] which contains no [[urea]], but a safe [[concentration]] of [[glucose]] and [[salt]]s to allow the [[diffusion]] of [[urea]] out of the [[blood]] due to a [[Concentration Gradient|concentration gradient]] but no [[diffusion]] of [[salt]]s or [[glucose]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f215 ''Dialysis, page 204-7, GCSE Biology; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Dialysis, page 76, GCSE Biology; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851338/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851338&linkCode=as2&tag=nrjc-21&linkId=425855d5890466e47189e1c21b67a1ea ''Dialysis, pages 157-8, GCSE Biology, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Dialysis, pages 188-191, GCSE Biology; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Dialysis, pages 219, 220, GCSE Biology, CGP, AQA '']