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8 July, 01:44

Sharks live in seawater. Their tissues are isotonic to seawater, but their concentrations of sodium ions, potassium ions, and chloride ions in cells and extracellular fluids are similar to those of freshwater fishes. How is that possible?

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  1. 8 July, 02:07
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    It is possible because the sodium and chloride will diffuse into shark gills from seawater down their concentration gradient.
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