We must understand normal structure and function so you"re able to identify abnormal or incorrect function. We must understand mechanisms of therapies used to treat dysfunction. If you understand what is wrong with the patient, you can compose a mechanism to treat them. We are trying to understand how does the human body work? : pathophysiology vs. physiology. Pathophysiology: functional changes associated with disease and aging. Anatomy: the branch of biology concerned with the study of the structure of organisms and their parts. Physiology: the branch of biology that deals with the study of organ function and interaction. Or the branch of biology that deals with the normal functions of living organisms and their parts: levels of organization of the human body, chemical, cellular, tissue, organ, organ system, system. Movement (both walking and the movement of substances in the internal environment) Growth: homeostasis, the overall job of every system in the body, balance!