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← Nature & AnimalsWhich disruption diminishes oxygen uptake efficiency during opercular pumping in fish gills?
A)Increased water temperature reducing viscosity
B)Damage to lamellae disrupting countercurrent exchange✓
C)Elevated salinity increasing osmotic pressure
D)Reduced opercular beat frequency due to toxins
💡 Explanation
When lamellae are damaged, the countercurrent exchange mechanism is disrupted because this specialized structure maximizes the oxygen gradient between the blood and ventilating water. Therefore oxygen uptake is diminished, rather than viscosity changes, osmotic pressure increases, or reduced frequency each involving other physiological responses.
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