Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 36 - Self-Quiz - Page 638: 2


c. both a and b

Work Step by Step

Birds and mammals have four-chambered hearts, which keep oxygen-rich and oxygen-poor blood completely separate. The pulmonary circuit takes oxygen-poor blood the heart had received from the tissues and pumps it to the lungs to pick up oxygen and then returns the now oxygen-rich blood to the heart. The systemic circuit takes the oxygen-rich blood that was returned to the heart from the lungs and pumps it to the tissues and then returns oxygen-poor blood picked up from the tissues back to the heart.
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