7 Which is CORRECT about the immune system? A All cells of the immune system hav

Question

7 Which is CORRECT about the immune system? A All cells of the immune system have B. Activated T cells divide into plasma cells. C. NK cells are phagocytic. D. Inteferons protect healthy cells from bacteria E. None of the above. a life span of weeks to several months. 8 Which best describes the type of immunity obtained by injection of immune serum? A Passive artificially acquired. B. Active naturally acquired. D. Active artificially acquired. C. Passive naturally acquired. E. None of the above. Which is a function of a fever? A. Promotes interferon activity. D. Inhibits production of bacteria and viruses. E. All of the above. 10. Which is NOT one of the cardinal signs of inflammation? 9. B. Elevates metabolic rate. C. Accelerates tissue repair. A. Redness. B. Pain. C. Edema. D. Heat. E. Fibrin formation. 11. Which is CORRECT about antibodies? A. Antibodies are proteins B. Antibodies have a variable region that determines specificity. C. Antibodies are held together by disulfide bonds. D. Antibodies have a complement binding site located on the heavy chain. E. All of the above. 12. Which may enhance inflammation? A. Neutralization. B. Agglutination. E. All of the above. C. Precipitation D. Complement Fixation. 13. Which is CORRECT about the immune system? A. Cytotoxic T cells are lowered in AIDS patients B. MHC I antigens are found on most body cells C. lgG levels are the first to increase during a primary response. D. Most of the T lymphocytes produced will assist in defending the body. E. None of the above.

Explanation / Answer

7.

Immune cells have certain life span. Some lymphocytes live for few weeks and others for months to years. With this distinct lifespan immune cells are capable of memory and produce immune response eliminating pathogens. B lymphocytes divide to produce plasma cels. Natural killer (NK cells) cells are capable inducing apoptosis in cells infected with voiruses or cancerous cells. Interferons are produced against virus infected cells. Therefore, option A is correct.

8.

Mother can transmit the antibodies to fetus through placenta and this is an example of passive natural immunity. Non- immune persons can receive antibody rich serum specific to a pathogen or toxin. This serum can be obtained from other persons or animals like horses. This kind of immunity is passive artificially acquired immunity. Therefore, option A is correct.

9.

Fever is natural defense and immune response produced against an infection. High temperature triggers rapid and peak immune action. Increased temperature also results in high metabolic rate and triggers rapid tissue repair during injuried. The eleated temperature inhibit the production of pathogens like bacteria and viruses. Therefore, option E is correct.

10.

Inflammation is host defense mechanism chracterized by redness, heat, swelling, pain and loss of function of tissues at the site of inflammation. Fibrin formation is not a cardinal sign of inflammation. Therefore, option E is correct.

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