Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 33, Circulatory and Respiratory Systems - Assessment - 33.1 The Circulatory System - Understand Key Concepts/Think Critically - Page 972: 7


The function of the pacemaker is to set the rhythm of contractions in the atria and ventricles of the heart.

Work Step by Step

The pacemaker or sinoatrial (SA) node generates an impulse that is spread throughout the atria, causing those two chambers to contract, sending blood into the ventricles. The atrioventricular node then receives the signal, and after a short delay, initiates the contraction of the muscles in the ventricle, thus sending blood into the aorta and pulmonary artery.
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