UNMC Patho Exam 2 Questions and Verified Answers | Passed | A+

Function of the immune system : 1) to protect the body from invasion by foreign antigens - foreign substances that trigger the immune response 2) to identify and destroy potentially harmful cells 3) to remove cellular debris What accomplishes the functions of the immune system? : lymphoid organs & specifically designed lymphocytes through the process of antibody-mediated immune response & cell-mediated immune response. General types of immune alterations - immune system acts inappropriately : 1) Exaggerated 2) Misdirected against host's own cells 3) Directed against beneficial foreign tissues 4) Deficiency / insufficient 2 What immune alterations are due to hypersensitivity reactions? : 1) Exaggerated 2) Misdirected against host's own cells 3) Directed against beneficial foreign tissues Exaggerated : overreaction against environmental antigens Allergic reaction = small Anaphylactic reaction = same as allergic reaction, but bigger Misdirected against host's own cells : autoimmunity = sees own cells as being foreign & destroys them. Directed against beneficial foreign tissues : isoimmunity = body's immune reponse against beneficial foreign tissue - i.e. organ transplants Hypersensitivity 3 : A pathologic immune response An exaggerated AND inappropriate immune response 1) Exaggerated 2) Autoimmunity 3) Isoimmunity Autoimmunity : Breakdown of that "code of recognition" Body's immune system begins to recognize self as foreign