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| living things to small to see without a microscope |
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| organisms that cause infectious disease |
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Definition
| a disease caused by a pathogen |
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| your body's second line of defense, which can include white blood cells, inflammation, and sometimes fever |
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| a white blood cell that engulfs pathogens and destroys them by breaking them down |
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| the third line of defense against a pathogen |
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| white blood cells that distinguish between different kinds of pathogens |
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| a lymphocyte that identifies pathogens and distinguishes one pathogen from another |
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| molecules that the immune system recognize as part of your body or as coming from outside your body |
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| lymphocytes that produce proteins to help destroy pathogens |
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| the proteins that B cells produce |
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| disease caused by a virus that attacks the immune system |
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| the only kind of virus know to attack the human immune system directly and destroy T cells |
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Definition
| the body's ability to destroy pathogens before they cause disease |
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Definition
| results from either getting a disease or being vaccinated |
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| the process by which harmless antigens are put into a person's body to produce active immunity |
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| consists of weakened or killed pathogens that trigger the immune response into action |
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| results when antibodies are given to a person |
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| a chemical that kills bacteria or slows their growth without harming body cells |
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Definition
| results when some bacteria are able to withstand the effects of an antibiotic |
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Definition
| diseases that are not caused by pathogens |
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Definition
| a reaction caused when the immune system is overly sensitive to a foreign substance |
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Definition
| any substance that causes an allergy |
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| a chemical that is responsible for the symptoms of an allergy |
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| a disease in which the airways in the lungs narrow significantly |
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| a substance that enables body cells to take glucose from the blood and use it for energy |
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| a disease caused when the pancreas produces either too little insulin or the body does not use the insulin properly |
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| a substance or factor in the environment that can cause cancer |
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