Which outcome occurs when the countercurrent exchange mechanism in a fish gill is disrupted by excess sediment?

💡 Explanation

When sediment disrupts countercurrent exchange, the reduced flow increases the diffusion distance because the concentration gradient is not effectively maintained between water and blood, hindering oxygen transfer. Therefore, reduced oxygen uptake occurs, rather than increased excretion, CO2 removal, or ionoregulation, each requiring specific transport mechanisms.

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