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Lesson 12.3: Immunity to Infection | Check Your Understanding

20. The thick, watery substance that shields the body from invading pathogens is called _____.
      A. cilia B. mucus C. phagocyte D. antigen
21. Which of the following describes the skin's defenses against infection?
      A. Mucus coats the inner surfaces, repelling pathogens. B. Many layers of scaly, overlapping cells form a physical barrier to pathogens. C. Skin oils make the surface acidic, which controls bacterial growth. D. Both B and C are true.
22. True or false? Bacteria in the large intestine act to block the growth of pathogens.
      A. True B. False
23. Which of the following statements is true about phagocytes?
      A. Phagocytes are pathogens that “eat” healthy tissue. B. Phagocytes reside in the body’s tissues, lymph nodes, spleen, and blood. C. Phagocytes are part of the body’s first line of defense against infection. D. Phagocytes are leaky blood vessels.
24. Explain how fever helps fight infection from pathogens.
    
25. True or false? B cells coordinate an organized and effective immune system.
      A. True B. False
26. List three ways antibodies work to fight infection.
    
27. True or false? Stress is capable of suppressing your immunity.
      A. True B. False
28. Critical Thinking. Analyze the role of inflammation in health.
    

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