The musculoskeletal system is the combination of the muscular and skeletal systems working together and includes the bones, muscles, tendons and ligaments of the body.he musculoskeletal system is the combination of the muscular and skeletal systems working together and includes the bones, muscles, tendons and ligaments of the body.
A social identity is the portion of an individual's self-concept derived from perceived membership in a relevant social group.s originally formulated by Henri Tajfel and John Turner in the 1970s and the 1980s, social identity theory introduced the concept of a social identity as a way in which to explain intergroup behaviour.
The ideas underlying social identity theory bridge the gulf between Tajfelâs early work on the cognitive consequences of categorization (Tajfel, 1969) and his historical experiences of the power of group membership to define who we are, how we feel and how we see and treat others as âotherâ.