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 Circulation - Understand Key Concepts/Think Critically - Page 803: 19



Work Step by Step

Chordates with gills have a single-loop circulatory system. In this type of circulatory system, oxygen-poor blood coming from the body enters the atrium of the heart is then pumped out from the ventricle to the gills, and then returns to the heart as oxygen-rich blood, which is then pumped back out to the body.
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