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: 13

Answer

d.

Work Step by Step

Option a. is incorrect. Red blood cells carry oxygen in the blood. Option b. is incorrect. Cilia are small hair-like projects used to move objects in a certain direction. Option c. is incorrect. Platelets are cell fragments that play an important role in the formation of blood clots. Option d. is correct. White blood cells called macrophages consume pathogens.
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