Pathology is a branch of medical science primarily concerning the cause, origin and nature of disease. It involves the examination of tissues, organs, bodily fluids and autopsies in order to study and diagnose disease. General pathology describes a complex and broad field that involves the study of the mechanisms behind cell and tissue injury, as well as understanding how the body responds to and repairs injury. Examples of areas that may be studied include necrosis, neoplasia, wound healing, inflammation and how cells adapt to injury.