Book excerpt: 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 and 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 texts. The authors' hallmark clear and friendly writing style has been strengthened with familiar analogies and abundant mnemonic cues that help in learning and remembering concepts. Continuing to offer just the right balance of anatomy, physiology, and clinical coverage, engaging new chapter previews help learners hone in on what structures and functions they are studying, how they function, and why they are important to learn. New vocabulary-building activities, a mobile-friendly eText, and Interactive Physiology 2.0 tutorials expand the options for using MasteringA&P as an effective practice and learning tool. Note: You are purchasing a standalone product; MyLab(tm)& Mastering(tm) does not come packaged with this content. Students, if interested in purchasing this title with MyLab & Mastering, ask your instructor for the correct package ISBN and Course ID. Instructors, contact your Pearson representative for more information. If you would like to purchase both the physical text and MyLab & Mastering, search for: 0134394194 / 9780134394190 Essentials of Human Anatomy & Physiology Plus MasteringA&P with eText -- Access Card Package, 12/e Package consists of: 0134395328 / 9780134395326 Essentials of Human Anatomy & Physiology 0134555112 / 9780134555119 MasteringA&P with Pearson eText -- ValuePack Access Card -- for Essentials of Human Anatomy & Physiology MasteringA&P should only be purchased when required by an instructor.