Diffusion of potassium in all regions of the filter occurs during countercurrent flow because the generation of diffusion gradient between water and the blood.
Flow of potassium
In counter current, the blood in the capillaries flowing in the opposite direction to the flow of water which creates a steep diffusion gradient which results in rapid transfer of potassium into the blood so we can conclude that diffusion occur in all regions of the filter due to countercurrent flow of both liquids.
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