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← Nature & AnimalsWhich outcome results when countercurrent exchange fails during antifreeze glycoprotein (AFGP) synthesis in Antarctic fish?
A)Reduced oxygen extraction from surrounding water
B)Increased blood viscosity at freezing temperatures✓
C)Prevents urea retention in bodily fluids
D)Decreased metabolic energy in liver functions
💡 Explanation
Increased blood viscosity results if countercurrent heat exchange warms blood during AFGP production; because this compromises cold adaptation. Without countercurrent heat exchange, temperature regulation will fail therefore the fish will freeze rather than continue enzyme (AFGP) production.
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