practice 15 -16.odt - Which of the following is NOT an...

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Which of the following is NOT an example of a physical barrier to infection? skin lungs defensins mucosal membranes Question 2 1 / 1 point Lysozyme is an example of a(n) chemical barrier. physical barrier. defensin. adaptive immune response. Question 3 1 / 1 point All of the following is true regarding a fever EXCEPT that the use of fever reducers helps to speed recovery. a fever creates an unfavorable environment for microbial growth. substances that cause a fever are known as pyrogens. thermoregulation is maintained by the hypothalamus. Question 4 1 / 1 point All of the following are components of the inflammatory process EXCEPT extravasation. release of cytokines. antibody synthesis. Vasodilation. Question 5 1 / 1 point Innate immunity includes all of the following EXCEPT phagocytosis. inflammation. activation of complement. production of antibody. Question 6 1 / 1 point A differential cell count is used to determine each of the following EXCEPT the total number of white blood cells. the numbers of each type of white blood cells. the number of red blood cells. the presence of cancer.
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Question 7 1 / 1 point CASE HISTORY Bobby, an 11-year-old boy from Nebraska, suffered his entire life from recurring life-threatening infections caused mostly by the Gram-positive bacteria Staphylococcus aureus and Streptococcus pneumoniae. His infections included meningitis, osteomyelitis (bone infection), and arthritis caused by S. pneumoniae, as well as episodes of septicemia and osteomyelitis and recurrent boils caused by S. aureus. Tests to find a cause for these recurring infections were initially disappointing. The results of all standard immunological tests were normal, including T-cell lymphocyte responses, blood antibody levels, and antibody responses to injected proteins and polysaccharides. This means his adaptive immune system was functioning. The numbers of monocytes/macrophages in his blood were also normal. However, pro-inflammatory cytokine levels (indicators of innate immunity) measured during the latest infection were considerably lower than expected. Further tests proved that Bobby
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