Keeps the concentration of dissolved substances the same and to remove waste substances.
>Blood flows next to selectively permeable barrier surrounded by dialysis fluid.
- permeable to things that would normally be filtered from the blood by the kidneys.
> Dialysis fluid is the same concentration of dissolved ions as the blood.
- means that nothing useful is lost from the blood.
- only waste substances and excess ions and water are lost.
Time consuming.
May cause blood clots.
May cause infections.
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