Answer
a. a $Na^+$ concentration gradient
Work Step by Step
The $Na^+$-$K^+$ pump creates a $Na^+$ gradient that the sodium-glucose cotransport takes advantage of. $Na^+$ goes down its concentration gradient while glucose hitches a ride.
Anatomy & Physiology: The Unity of Form and Function, 7th Edition
by Saladin, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0073403717
ISBN 13:
978-0-07340-371-7
Chapter 3 - Cellular Form and Function - Study Guide - Testing Your Recall - Page 110: 7
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