Rheumatoid arthritis and type 1 diabetes are classified as autoimmune diseases because in each of them
Correct answer: A. the immune system attacks the body's own tissues
- A. the immune system attacks the body's own tissues
- B. the body cannot make any antibody at all
- C. a virus destroys the helper T cells
- D. an allergen provokes the release of histamine
Explanation
Self tolerance breaks down and lymphocytes treat a normal body component as foreign, the synovial membrane in rheumatoid arthritis and the insulin secreting beta cells in type 1 diabetes. The damage is therefore done by the patient's own immune system, which is why treatment suppresses immunity. An inability to make antibody is immunodeficiency, and an exaggerated response to a harmless substance is allergy.
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About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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