Answer
The lines of defense of the body are:
First Line: Mostly physical like skin, mucus, Keratin, Stomach lining, etc
Second Line: It consists of Phagocytes, Inflammatory reaction, Immunity against diseases, White blood cells, etc
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 35, Immune System and Disease - 35.2 - Defenses Against Infection - 35.2 Assessment - Page 1019: 1a
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