For one-semester Anatomy & Physiology courses. Focus on the essential what, how, & why of human anatomy & physiology With the 12th Edition of Essentials of Human Anatomy & Physiology, science educator Suzanne Keller joins bestselling author Elaine Marieb in helping learners focus on the essential What, How, & Why of A & P, without getting sidetracked in unnecessary details. Thoroughly updated with dozens of new figures, photos, and current information on medical recommendations and terminology, the 12th Edition continues to set the standard for brief, accessible one-semester A & P text.