Chapter Introduction
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iii
SANDRA E. HOCKENBURY
SUSAN A. NOLAN
DON H. HOCKENBURY
Seventh Edition
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Publisher: Rachel Losh
Executive Acquisitions Editor: Daniel McDonough
Developmental Editor: Marna Miller
Senior Marketing Manager: Lindsay Johnson
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Media Producer: Elizabeth Dougherty
Media Editor: Jessica Lauffer
Editorial Assistant: Kimberly Morgan-
Photo Editor: Christine Buese
Photo Researcher: Jacquelyn Wong
Director, Content Management Enhancement: Tracey Kuehn Managing Editor: Lisa Kinne
Project Editor: Ed Dionne, MPS North America LLC
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Cover and Interior Designer: Charles Yuen
Art Manager: Matthew McAdams
Art Illustrators: Todd Buck, Anatomical Art; TSI evolve
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Cover Photos: RGB Ventures/SuperStock/Alamy (background), Patrick Foto/ Getty Images (left), Image Source/Getty Images (right)
Library of Congress Preassigned Control Number: 2015955442
ISBN-
ISBN-
© 2016, 2014, 2011, 2007 by Worth Publishers
All rights reserved.
Printed in the United States of America
Second printing
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To Laura, for the love and laughter along the way—
For Mira, Sophie, and Julie—