Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 13 - Think and Explain: 55

Answer

When you are lying down, your heart does not have to pump blood to the large range of different heights that are present when you are sitting. When you're lying down, the blood pressure in your legs would be less than when you are sitting or standing.
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