Human Anatomy & Physiology (9th Edition)

Published by Pearson
ISBN 10: 0321743261
ISBN 13: 978-0-32174-326-8

Chapter 21 - The Immune System: Innate and Adaptive Body Defenses - Review Questions - Page 799: 5

Answer

A

Work Step by Step

IgA antibody is the most abundant antibody in body secretions . It is present in breast milk and secretions such as mucus, saliva and tears. It plays no role in fixation of complement but prevents attachment of pathogens to mucous membrane.
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