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 37 - Self-Quiz - Page 664: 2

Answer

e

Work Step by Step

The first line of defense includes those barriers that physically, chemically, or mechanically obstruct the actions of pathogens. These include the skin, acid in the stomach, and lysozymes found in the saliva. The only item in this list is complement activation. This action belongs to the second line of defense after the pathogen has invaded the body.
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