The Number 1 book in its field. Provides an in-depth introduction to the function of human body systems for students majoring in the biological/life/allied health sciences. Includes extensive coverage of cellular physiology with special attention to exercise physiology. Introduces concepts through a systematic approach organized around the central theme of homeostasis, gives frequent references to pathophysiology and clinical physiology, and uses extensive analogies and examples from common life experiences. The Third Edition features a revised art program, and new quantitative problems and exercises (2-4 per chapter).