Which outcome occurs when countercurrent exchange fails in fish gills exposed to acidification?

💡 Explanation

When acidification interferes with countercurrent exchange, pH gradients disrupt oxygen binding at the uptake surface because reduced pH impairs hemoglobin's oxygen carrying capacity, leading to overall lower efficiency.Therefore, reduced oxygen uptake efficiency results, rather than altered diffusion, pH shift or salinity imbalance that occur via separate complex biochemical mechanisms.

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