Human Biology, 14 Edition

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

Chapter 5 - Assess - Page 112: 5

Answer

B. Veins

Work Step by Step

Veins contain valves to ensure that blood can only flow forward toward the heart and not backward toward the capillaries.
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