Hirst's 'Trinity' consists of a trio of cabinets, the central being larger than the outer two, akin in style to a religious triptych. The name 'trinity' itself holds significant religious meaning, the union of three persons (Father, Son and Holy Ghost) in one Godhead; three becoming one. Here Hirst is focusing on three types of scientific study into the human body, factors which have now come to govern our everyday lives. Each cabinet is shelved and filled with plastic medical teaching models, most of which have been purchased from medical supply catalogues. Pharmacology is the science dealing with the preparation, uses, and especially the effects of drugs. Physiology is the branch of biology dealing with the functions and activities of living organisms and their parts, including all physical and chemical processes. Pathology is the science or the study of the origin, nature, and course of diseases.