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← Nature & AnimalsWhich outcome occurs when a saltwater fish experiences prolonged exposure to freshwater?
A)Cellular swelling due to osmotic influx✓
B)Increased opercular ventilation rate
C)Elevated chloride cell activity
D)Reduced kidney filtration rate
💡 Explanation
When a saltwater fish is in freshwater, osmosis causes water to flow into the fish's cells because of a lower solute concentration, which leads to cellular swelling, due to passive diffusion. Therefore cell swelling results, rather than ventilation increase, chloride cell activity, or reduced filtration which would require salinity maintenance in saltwater.
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