Which mechanism facilitates osmoregulation in freshwater fish gills experiencing constant water influx?

💡 Explanation

In freshwater, fish experience constant water influx and ion loss; therefore active transport via chloride cells in their gills uptake sodium and chloride ions from surroundings because concentration gradients favor ion loss. Therefore active chloride cells uptake results, rather than passive diffusion, reduced urinary output to conserve or increased integument which would hinder the gill's normal osmoregulatory role.

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