Now in its Third Edition, this text clearly and concisely presents the physiological principles that are essential to clinical medicine. Outstanding pedagogical features include Active Learning Objectives that emphasize problem-solving applications of basic principles; conceptual diagrams that help students visualize complex processes; case studies, Clinical Focus boxes, and Bench to Bedside boxes; a comprehensive glossary; and online USMLE-style questions with answers and explanations. This edition features a new Immunology and Organ Function chapter and a completely rewritten and reorganized cardiovascular section. A companion Website will include the fully searchable text, an interactive question bank, case studies with practice questions, animations of complex processes, an image bank, and links for further study.