Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 49 - The Circulatory System - Review Questions - Synthesize: 4

Answer

A mechanical pacemaker takes the place of the SA node, so malfunctions of the SA would be signs: irregular heartbeat and/or irregular eletrical activity in the heart.

Work Step by Step

First, review normal pacemaker function in the body; imagine from that what symptoms arise when it fails to function properly. From that, you can deduce the symptoms.
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