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Health lesson 44

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Term
Definition
lymphocytes   white blood cells that help the body fight pathogens  
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B cell   a white blood cell that produces antibodies  
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anitbody   a special protein that helps fight infection  
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helper T cell   a white blood cell that signals B cells to produce antibodies  
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macrophage   a white blood cell that surrounds and destroys pathogens  
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immunity   the body's Resistance to disease-causing agents  
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active immunity   resistance to disease due to the presence of antibodies  
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vaccine   a substance containing dead or weakened pathogens that is introduced into the body to give immunity  
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passive immunity   immunity that results from introducing antibodies into a person's bloodstream  
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pathogen   a germ that causes disease  
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bacteria   single-celled microorganisms  
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toxins   poisonous substances  
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immune system   the system that removes harmful organisms from the blood and combats pathogens  
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Rickettsia   intracellular parasites that are classified as bacteria  
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fungi   a pathogen that includes single- or multi-celled parasitic organisms  
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virus   one of the smallest known pathogens  
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protozoa   tiny, single-celled organisms that produce toxins that cause disease  
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helminth   a parasitic worm  
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