Unlike metaphysics, the science of physiology explores the living processes of an organism. With the help of exploration in this venue, one understands the underlying chemical and physical changes and the structural peculiarities of the whole system. Hence, to have an insight into the working processes of a living organism, knowledge of chemistry, biology, microscopic anatomy, etc., becomes very inter-disciplinary, and the relationship of one discipline to the other becomes very complex. This interdisciplinary junction is located on the plane of ERGONOMICS.

Ergonomics is coined from two Greek words: "ergos" (work) and "nomos" (natural laws). So on the basis of work measurement, studies are done on the energy spent by the organism while in action. The dimensions of the human body and its segment proportions have apparently always been of much interest to physicians, anatomists, and artists, too. Marco Polo described his travels around the earth in the 13th century, evoking particular interest with his descriptions of various body sizes, regions, and physiology relationships. Even the artist Leonardo da Vinci studied human body anatomy and basic structure to get the right sense of human proportions.