Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 27, Animal Systems I - Assessment - 27.3 - Understand Key Concepts - Page 802: 17



Work Step by Step

An open circulatory system is characteristic of arthropods and many mollusks. In an open circulatory system, blood does not move through closed blood vessels. Instead, the vessels carry blood to open sinuses where the tissues are directly bathed by the blood. Other sinuses then collect the blood to return it to the heart or hearts.
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