Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 49 - Circulatory Systems - 49.4 - Circulatory System Functions Depend on Blood and Blood Vessels - 49.4 Recap - Learning Outcomes - Page 1062: 4


Blood is returned to the heart from the lower body against the force of gravity through the involuntary contraction of skeletal muscles that squeeze the blood back upwards.

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