Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 42 - 42.5 - Concept Check - Page 942: 3


Countercurrent flow maximizes gas exchange and maintaining heat.

Work Step by Step

Fish utilize countercurrent flow in their gills, where blood runs opposite to the direction of flowing water. Some animals use it for thermoregulation by having vasculature running in opposite directions against each other in the extremities.
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