Anatomy & Physiology: The Unity of Form and Function, 7th Edition

Published by McGraw-Hill Education
ISBN 10: 0073403717
ISBN 13: 978-0-07340-371-7

Chapter 19 - Section 19.5 - Figure 19.20 - Modified Wiggers Diagram, Illustrating Events of the Cardiac Cycle - Page 732: 1

Answer

At about 0.5 seconds, the aortic valve opens releasing a push of blood into the aorta.

Work Step by Step

At about 0.5 seconds, the aortic valve opens and the left ventricle ejects blood into the aorta. This causes the aorta to stretch and baroreceptors measure the increase in blood pressure.
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