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 38 - Self-Quiz - Page 685: 11



Work Step by Step

Blood and water moving in opposite directions in fish gills causes what is called a countercurrent exchange. Because the water flowing next to the gill capillaries contains more oxygen than the blood in the capillaries, oxygen diffuses from the water to the blood.
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