Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 5 - Assess - Page 112: 9

Answer

d. Electrical changes in the wall of the heart.

Work Step by Step

An electrocardiogram (ECG) records electrical changes occurring in the myocardium, the tissue that makes up the walls of the heart. This information is used to determine whether or not the heart is working properly.
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