Human Anatomy & Physiology (9th Edition)

Published by Pearson
ISBN 10: 0321743261
ISBN 13: 978-0-32174-326-8

Chapter 18 - The Cardiovascular System: The Heart - Review Questions - Page 689: 1(1)

Answer

A

Work Step by Step

AV valves are closed-ventricles are in systole-blood enters the aorta-blood enters pulmonary arteries.
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