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 - 49.1 - Circulatory Systems Serve Many Functions - 49.1 Recap - Learning Outcomes - Page 1045: 2


Open circulatory systems are rarely found in more developed animals because they usually hold less blood pressure. This makes it difficult for the blood to transport oxygen and other essential molecules to their designations in a timely manner, thus limiting the size of organisms that do have open systems. Insects thrive with their open circulatory systems due to their ostia, which promotes unidirectional flow.

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