This text is a concise and clinical presentation of physiological processes that gives students the essentials in an understandable format. New to the Second Edition: USMLE-style questions; a case study with questions in each chapter; new topics such as adaptive physiology (weightlessness, high altitude, exercise) and clinical topics (pain, congestive heart failure, gastrointestinal disorders); completely rewritten gastrointestinal section; expanded kidney transport information; and clinical focus boxes added to each chapter.