Answer
$Na^+$
Work Step by Step
The pacemaker potential of the SA node cells results from the slow inflow of $Na^+$.
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 19 - The Circulatory System: The Heart - Study Guide - Testing Your Recall - Page 741: 14
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