Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 5 - Section 5.4 - Features of a Cardiovascular System - Check Your Progress - Page 102: 3

Answer

Valves are required in the veins to ensure that blood can only flow forward toward the heart and not flow backward toward the capillaries. This ensures that blood continues to circulate throughout the body.

Work Step by Step

Valves are required in the veins to ensure that blood can only flow forward toward the heart and not flow backward toward the capillaries. This ensures that blood continues to circulate throughout the body.
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