13. Which of the following is true of the innate immunity? A. Caused by infection B. Depends on physical and chemical barriers C. Induced by vaccination D. Specific toward a pathogen E. All of the above 14. Which of the following is NOT a physical barrier to potential pathogens? A. Cilia B. Hair C. Mucus D. Skin E. All of the above are physical barriers
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Step 1: The innate immunity is true in that it depends on physical and chemical barriers, and is non-specific towards a pathogen. Show more…
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The physical barriers that are part of the immune system function by having a. mucus that traps pathogens and other foreign substances b. None of the answers are correct c. All of the answers are correct d. tightly packed epithelial cells that prevent pathogens from entering tissues e. cilia that sweep mucus out of the throat
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Select examples of chemical barriers to infection in the human body. Pick from the choices below, there maybe more then one answer. a. The low pH in the stomach kills pathogens entering the digestive system. b. The acidic surface of the skin prevents bacterial growth. c. Macrophages phagocytize pathogens in the body. d. Enzymes in tears break down pathogens that touch the eyes. e. Hairs located in the ears and nose block pathogens. f. Antibodies recognize pathogens and attack infected cells. g. Sticky mucus traps pathogens entering the respiratory system.
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Which of the following is NOT an example of a nonspecific defense mechanism? (A) Skin provides a physical barrier against invasion. (B) Macrophages engulf and destroy foreign particles. (C) An inflammatory response is initiated in response to physical damage. (D) Cytotoxic T-cells destroy cells displaying foreign antigens.
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