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Unit 12: Immune System Disorders Unit 12: Immune System Disorders Allergies: • An inaccurate immune system response to something usually harmless like pollen, fur, a particular food, or dust. • Body releases Histamine causing inflammation and constriction of smooth muscle (breathing issues) Unit 12: Immune System Disorders Autoimmunity: Autoimmune Diseases Your immune system attacks healthy cells by mistake. • Lupus • Rheumatoid Arthritis • Psoriasis • Celiac Disease Unit 12: Immune System Disorders Acquired Immune Deficiency Syndrome: AIDS A severe loss of function of the entire Immune System. Caused by a retrovirus (HIV) which destroys Helper T cells.