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 20 - Section 20.4 - Figure 20.18 - An Illustration from William Harvey's De Motu Cordis (1628) - Page 762: 3

Answer

Fig.20.18:3. Pressure on a vein will prevent blood from flowing towards the heart.

Work Step by Step

However, because of the structure of venous valves, they prevent blood from flowing away from the heart, but do not impede the flowing of blood towards the heart.
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