Answer
Because the symporter uses energy stored in the Na+ concentration gradient created between the extracellular fluid and the cytosol.
Work Step by Step
Primary active transport uses the energy released by the hydrolysis of ATP
Principles of Anatomy and Physiology 14e with Atlas of the Skeleton Set (14th Edition)
by Tortora, Gerard J.
Published by
Wiley
ISBN 10:
1-11877-456-6
ISBN 13:
978-1-11877-456-4
Chapter 26 - The Urinary System - Figure 26.15 - Page 1000: 1
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