The filter regions that have concentration gradients between the blood and dialysate are ; ( I and II ).
The filter regions ( I and II ) both have concentration gradients because of the concentration difference between the Urea contained in the blood and the Urea concentration found in dialysis
The difference in concentration gradients of the filter regions between the blood and dialysate leads to the diffusion of Urea in blood into the dialysis fluid with a lower concentration of Urea.
Hence we can conclude that The filter regions that have concentration gradients between the blood and dialysate are ; ( I and II ).
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