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 690: 13a

Answer

When the heart is relaxed the coronary arteries are sending blood to the myocardium. However, when the ventricles are contracting. The coronary vessels are being pressed and are not able to send blood.

Work Step by Step

When the heart is relaxed the coronary arteries are sending blood to the myocardium. However, when the ventricles are contracting. The coronary vessels are being pressed and are not able to send blood.
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