Campbell Biology (11th Edition)

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

Chapter 44 - 44.1 - Concept Check - Page 980: 1


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.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.