Answer
b) movement of the excitation wave across the heart
Work Step by Step
An electrocardiogram shows a record of the electrical currents that are created and move the heart, which is the result of excited cells.
Human Anatomy & Physiology (9th Edition)
by Marieb, Elaine N.; Hoehn, Katja N.
Published by
Pearson
ISBN 10:
0321743261
ISBN 13:
978-0-32174-326-8
Chapter 18 - The Cardiovascular System: The Heart - Review Questions - Page 689: 3
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