Answer
a. damage to the SA node
Work Step by Step
A heart rate of 45 bpm and an absence of P waves suggest damage to the SA node. The P wave is produced when a signal from the SA node spreads through the atria.
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: 4
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