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← Nature & AnimalsWhich limitation arises in fish gills if blood and water flowed in the same direction?
A)Oxygen uptake efficiency reduced significantly✓
B)Ammonia excretion becomes energetically expensive
C)CO2 accumulation leads acid-base imbalance
D)Water viscosity slows down oxygen uptake
💡 Explanation
If water and blood flowed in the same direction, a concentration gradient would quickly equilibrate via concurrent exchange, limiting the maximum possible oxygen uptake, reducing efficiency. Therefore, uptake decreases significantly rather than affecting excretion, CO2 accumulation, or water viscosity, which involve different biophysical mechanisms.
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