Essentials of Anatomy and Physiology Author:Rod R. Seeley, Trent D. Stephens, Philip Tate Designed for the one-semester course, Essentials of Anatomy and Physiology is written to allow instructors the ability to accomplish one main goal: to teach the basics of A&P while fostering the skills of problem solving. The text focuses on two major themes: 1)the relationship between structure and function, and 2)homeostasis.