Biology 2010 Student Edition

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

Chapter 33, Circulatory and Respiratory Systems - Assessment - 33.2 Blood and the Lymphatic System - Understand Key Concepts/Think Critically - Page 972: 14

Answer

b.

Work Step by Step

Option a. is incorrect. Veins are blood vessels that return blood to the heart. Option c. is incorrect. Arteries are blood vessels that transport blood away from the heart. Option d. is incorrect. The atria are the upper chambers of the heart that receive blood from the body. Option b. is incorrect. Capillaries are the smallest blood vessels in the body. These vessels have the diameter of approximately a single red blood cell. It is through the thin walls of capillaries that nutrients, wastes, and gases are exchanged.
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