Which outcome occurs when blood flow stalls during countercurrent exchange within fish gills at cold temperatures?

💡 Explanation

Inefficient ventilation causes decreased oxygen concentrations in the water near the gills; because countercurrent exchange thrives on differential concentrations, the slowing blood picks up even less oxygen. Therefore, there is reduced oxygen uptake efficiency, rather than enhanced gas exchange, as the gradient deteriorates.

• Which outcome impairs fish gill oxygen absorption when water temperature increases significantly?
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