Campbell Biology
Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 42.5, Problem 3CC

MAKE CONNECTIONS → Describe similarities in the countercurrent exchange that facilitates respiration in fish and thermoregulation in geese (see Concept 40.3).

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Animals often face trade-offs, and one of the goals of modernphysiology is to understand mechanistically why improvementof performance in one way may degrade performance in otherways. In freshwater fish, explain why O2 uptake and Ca2+ uptakeprobably cannot be simultaneously maximized. In other words,why is there a trade-off between the ability to take up O2 and theability to take up Ca2+?
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