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Quick question: Kidney Dialysis
In a dialysis machine, why must the blood and the dialysis fluid flow in opposite directions? I think it is something to do with diffusion/osmosis, etc. Thanks.
Dialysis is to do with diffusion. Although I'm not totally at ease commenting about the necessity for them to flow in different directions, the dialysis fluid has to be carefully produced in order for the correct amount of different substances to be taken from the blood, thus going from a high concentration in the blood to a low concentration in the fluid.
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