20. Acidic barrier is used as a first line of defense by all of the following st
ID: 255070 • Letter: 2
Question
20. Acidic barrier is used as a first line of defense by all of the following structures, EXCEPT: a. skin b. stomach c. vagina 21. Antigen presenting cells (APC): a. are macrophages and dendritic cells b. use MHC- II molecules to display antigens c. engulf and process antigens for presentation to T-helper cells d. strategically located in lymph nodes and other secondary lymphoid organs e. All of the above. 22. Mrs. Jones titer shows high level antibodies but she has never had Chagus disease. Mrs. Jones is scared, although she has had no sign of illness, even after being exposed to this contagious disease. She is exhibiting: a. natural acquired active immunity. b. natural acquired passive immunity. c. an allergic reaction. d. innate immunity e. artificial acquired passive immunity 23. The only T-cell population that can directly attack and kill cells are the: a. T-cytotoxic cells. b. T-helper cells. c. T-suppressor cells. d. T-plasma cells. e. T-hypersensitive cells 24. Which of the following pairs of organs would NOT be drained by the thoracie duct? 1. pancreas and stomach 2. right molar and right breast 3. appendix and left kidneys 4. left knee and spleen 5. right testes and left ovary a. 2 only b. 1, and 4 c. 4 and S d. 2, 3 and s c. 1 onlyExplanation / Answer
20. D. Nasopharynx.
Secretion from Skin glands such as sweat and sebum makes surface of skin acidic which inhibits growth of microbes. Stomach produces HCl which kills microbes that escape saliva. Vagina- naturally harbours some bacteria that produce some acids such as lactic acid which makes environment of vagina- acidic and inhibits growth of microbes.
21. E. All of the above.
22. A. Natural acquired active immunity.
Immunity that develops in an individual due to production of antibodies as a result of natural exposure to pathogen is called as natural acquired active immunity.
23. A T-cytotoxic cells.
Cytotoxic cells are also called killer T cells or CD8+ cells and these cells are the actual soldiers of immune system. These cells migrate to the site of infection and kill the infected cell by secreting protiens performs and lymphotoxins.
24. 2. Right molar and right breast.
These structures are drained by right lymphatic duct.
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