NURSING 4311 - FINAL EXAM REVIEW.

NURSING 4311 - FINAL EXAM REVIEW/NURSING 4311 - FINAL EXAM REVIEW. Completed chapters: 21, 22 Chapter 19 - Immune system Antigen-Antibody Response •The body makes antibodies in response to foreign substances •Antigen- foreign substance to body (ex-bacteria) •Antibodies: help fight off invasion by “foreign” substances. •Immunity - the ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells. Structure and Function of the Immune System •Principle behind immune system function: ability to distinguish self from non-self. •Major histocompatibility complex (MHC), also known as human leukocyte antigen (HLA), marks cells in body as self. •Anything that lacks this biological marker is considered non-self. •Immune response: reactions of immune system to antigens. •Immune system does not work properly: line between self and non-self becomes blurred. •Autoimmune condition •Allergic reaction