Exam 17: Immunological Disorders

Which allergic condition is characterized by the formation of a wheal and flare?

Why does a sensitized person not experience a skin reaction immediately after exposure to poison oak?

Which of the following is/are caused by immune-complex mediated hypersensitivities?

First exposure to an allergen results in a violent hypersensitivity reaction.

Defects in bone marrow stem cells result in a condition known as

Your father has just been diagnosed with rheumatoid arthritis. He has pain and the sensation of "pins and needles" in some if his finger joints and also in his wrists. He knows you covered autoimmune diseases in your microbiology class, so asks you to help him understand his condition. -You explain to your father that usually, the immune system routinely eliminates or silences any lymphocytes that recognize autoantigens, which are the "self" antigens found in cells and on body tissues. This process is called self-tolerance. In autoimmune disease, self-tolerance is faulty. There are at least two mechanisms that lead to self-tolerance. Which are they? 1) Negative selection of developing lymphocytes that recognize autoantigens, resulting in apoptosis of those cells. 2) Introduction of antigen by the oral route, so that the immune system "learns" to tolerate it, just as it does the many antigens ingested in food. 3) Failure of naive lymphocytes that recognize antigen but do not receive the necessary second signals (MHC) to become responsive.

Your father has just been diagnosed with rheumatoid arthritis. He has pain and the sensation of "pins and needles" in some if his finger joints and also in his wrists. He knows you covered autoimmune diseases in your microbiology class, so asks you to help him understand his condition. -You discuss treatment approaches that are taken for various autoimmune diseases. Which of the following is NOT a reasonable option for treating autoimmunity?