Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 44 - 44.1 - Concept Check: 1

Answer

Active transport is required to move chemicals against their concentration gradient.

Work Step by Step

A freshwater fish would presumably have less salt in its blood than would be present in the surrounding water. Diffusion only moves molecules from an area of high concentration to one of lower concentration. Movement of salt from the lower concentration, water, into the area of higher concentration, blood, requires active transport and the use of energy.
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