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: 22


An antibody monomer, for example in an IgG molecule, has four polypeptide chains , two light chains and two heavy chains. Each chain has a variable and a constant region.

Work Step by Step

The variable region recognizes and binds to the antibody's unique antigen. The constant region determines (decides on ) the mechanism that the antibody will use to mark the antigen ( foreign entity/substance) for destruction --neutralization, agglutination, precipitation or complement fixation..
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