Introduction to the topic: The study of the human body and its functions is Anatomy & Physiology. The human body consists of many parts with each part having a function. These parts and their functions need to be identified systematically. Hence, A&P is a science. Once you learn the structures and functions you will understand that the human body is complex and yet fascinating. In this module you will note that the study is divided into many categories such as gross anatomy, cytology, histology and so on..