Which limitation arises in Antarctic fish due to countercurrent heat exchange at extremely cold temperatures?

💡 Explanation

At extremely cold temperatures, antifreeze glycoproteins prevent freezing, but countercurrent exchange cools blood close to freezing at gills, increasing oxygen's binding affinity and hindering its release to tissues due to increased hemoglobin affinity. Therefore, reduced oxygen uptake efficiency results, rather than glycolytic inefficiency or nerve transduction, which depend on enzymatic function and action potential dynamics respectively.

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