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← Nature & AnimalsWhich outcome decreases swimming efficiency when a fish hyperventilates?
A)Increased opercular pump performance
B)Reduced gill filament surface tension
C)Disrupted countercurrent exchange✓
D)Enhanced blood oxygen saturation
💡 Explanation
Disrupted countercurrent exchange occurs because vigorous ventilation alters water flow, decreasing oxygen extraction efficiency; therefore, fish fatigue and swimming efficiency drops, rather than increasing arterial saturation under normal conditions.
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