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Pathogen An organism that causes disease Infectious Disease A disease caused by the presence of a living thing in the body Toxin A poison produced by biological pathogens that damage cells Inflammatory Response Part of the body’s defense against pathogens, fluid and white blood cells leak from blood vessels and destroy pathogens Phagocyte A white blood cell that destroys pathogens by engulfing them and breaking them down Immune Response Part of the body’s defense against pathogens, white cells of the immune system react to pathogens with defense specifically designed to fight it Lymphocyte White blood cell that distinguishes between each kind of pathogen T Cell A lymphocyte that identifies pathogens and distinguishes one pathogen from another Antigen A molecule that the immune system recognizes either as part of the body or as coming from outside of the body B Cell A lymphocyte that produces proteins that help destroy pathogens Antibody A protein produced by as B cell of the immune system that destroys pathogens AIDS Acquired immunodeficiency syndrome A disease caused by a virus that attacks the immune system HIV Human immunodeficiency virus The virus that causes AIDS Immunity The body’s ability to destroy pathogens before they can cause disease Active Immunity Immunity that occurs when a person’s own immune system produces antibodies in response to a pathogen Vaccination Vaccine Antibiotic Passive Immunity Noninfectious Disease The process by which harmless antigens are deliberately introduced into a person’s body to produce active immunity A substance used in a vaccination that consists of a weaken or killed pathogen that can trigger the immune system into action A chemical that kills bacteria or slows down their growth rate without harming cells Immunity in which antibodies are given to a person rather than produced in a person’s body A disease that is not caused by a pathogen Allergy A disorder in which the immune system is overly sensitive to a foreign substance Allergen A substance that causes an allergy Histamine A chemical that is responsible for the symptoms of an allergy Asthma A disorder in which the respiratory passages narrow significantly Insulin A chemical produced in the pancreas that enables the body’s cells to take in glucose from the blood and use it for energy Diabetes A condition in which either the pancreas fails to produce enough insulin or the body’s cells cannot use it properly Tumor An abnormal tissue mass that results from the rapid division of cells Carcinogen A substance or factor in the environment that can cause cancer