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Exchange surfaces of fish Are you ready for some gas exchange biology? #exchange surfaces biology #counter-current #fish gills #gas exchange in fish #Biology #A Level Biology #Biology Revision Hack Question: The gills of a fish use a counter-current exchange system. Explain the advantage of this system over a parallel flow system in maintaining gas exchange efficiency. Answer: In a counter-current system, blood flows in the opposite direction to the water across the lamellae. This ensures that t
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