Which metabolic inefficiency arises when concurrent instead of countercurrent flow occurs in fish gills,?

💡 Explanation

When concurrent flow occurs, the oxygen gradient between water and blood equilibrates quickly, because blood and water concentrations reach equilibrium instead of maintaining a maximum gradient along the gill lamellae. Therefore reduced oxygen extraction results, rather than CO2 accumulation, ammonia toxicity, or glucose starvation, which are due to different mechanisms.

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