New Design and Illustrations
A new, colorful design and revised illustrations enhance the features of Understanding Human Anatomy and Physiology, fifth edition.

Organization
This edition follows the same general sequence as the earlier editions. It is divided into five parts:

Part I, “Human Organization,” provides an understanding of how the body is organized and the terminology used to refer to various body parts and their locations. Chapters 2 through 4 describe the chemistry of the cell, cell structure and function, and the tissues and membranes of the body.

Part II, “Support, Movement, and Protection,” includes the integumentary system in addition to the skeletal and muscular systems.

Part III, “Integration and Coordination,” explains that the nervous and endocrine systems are vitally important to the coordination of body systems, and therefore homeostasis, while the sensory system provides the nervous system with information about the internal and external environments.

Part IV, “Maintenance of the Body,” describes how the cardiovascular, lymphatic, respiratory, digestive, and urinary systems contribute to the maintenance of homeostasis.

Part V, “Reproduction and Development,” concerns the reproductive systems, development, and the basics of human genetics, including modern advances.

Homeostasis
The theme of homeostasis is strengthened in this edition. As before, Chapter 1 describes how various feedback mechanisms work to maintain the internal environment within a narrow range. New to this edition, each systems chapter ends with a major section on homeostasis to accompany the “Human Systems Work Together” illustration. This section describes how the system under discussion, with the help of the other systems, maintains homeostasis.

New Readings
Understanding Human Anatomy and Physiology, fifth edition, has two types of readings. Previously, the book had two types of readings called Medical Focus and MedAlert. In this edition, the readings are Medical Focus and What’s New. Some of the Medical Focus readings from the fourth edition have been removed, and most of the others have been revised. The What’s New readings, which are new to this edition, tell of treatments that are now experimental but promise to be particularly helpful in the future. For example, a What’s New box in the first chapter tells about organs made in the laboratory that are now being transplanted into patients. The What’s New reading in Chapter 8 describes a “pacemaker” for Parkinson disease.

Chapter Openers
Scanning electron micrographs, X-rays, and MRI images open the chapters for a closer look into the wonders of the human body. The integrated outline has been retained with the addition of a numbering system for each major concept found in the chapter, including the summary.

Visual Focus
Visual Focus illustrations are included in several chapters. With the addition of boxed statements, these in-depth illustrations, which contain several art pieces, cover a process from start to finish. For example, Figure 7.3 outlines contraction of a muscle from the macroscopic to the microscopic perspective.

Chapter End Matter
This edition includes updated Selected New Terms, Summaries, Study Questions, Objective Questions, Medical Terminology Reinforcement Exercises, and Website Links to the Online Learning Center.

Objective Questions
Labeling exercises have been added to chapters 8, 11, 14, and 18 to reinforce the concepts of the chapter.