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← Nature & AnimalsWhich outcome occurs when fish gills exhibit reduced lamellar surface area?
A)Decreased opercular beat frequency
B)Increased blood oxygen saturation
C)Reduced efficiency of gas exchange✓
D)Enhanced buoyancy control capacity
💡 Explanation
When gill lamellar surface area decreases due to damage or disease, gas exchange efficiency diminishes because the area available for diffusion is reduced affecting oxygen uptake from water to blood. Therefore reduced gas exchange results, rather than increased saturation, decreased frequency, or enhanced buoyancy which depend on alternative physiological mechanisms.
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