Which consequence of increased metabolic demand in a tuna impacts the gill filaments?

💡 Explanation

A tuna's high metabolic demand causes increased blood flow across the gills. By increasing blood flow through the gill filaments to meet physiological demands, residence time decreases. The countercurrent exchange system suffers from diminished oxygen extraction efficiency because of this reduced contact time, therefore limiting oxygen diffusion rather than enhancing CO₂ removal or membrane integrity.

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