What is meant by “countercurrent flow” as it applies to fish gills?

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN:9781305967359
Author:STARR
Publisher:STARR
Chapter35: Respiration
Section: Chapter Questions
Problem 3SA: Countercurrent flow of water and blood increases the efficiency of gas exchange in ______. a. fishes...
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What is meant by “countercurrent flow” as it applies to fish gills?

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