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Health lesson 44

lymphocytes white blood cells that help the body fight pathogens
B cell a white blood cell that produces antibodies
anitbody a special protein that helps fight infection
helper T cell a white blood cell that signals B cells to produce antibodies
macrophage a white blood cell that surrounds and destroys pathogens
immunity the body's Resistance to disease-causing agents
active immunity resistance to disease due to the presence of antibodies
vaccine a substance containing dead or weakened pathogens that is introduced into the body to give immunity
passive immunity immunity that results from introducing antibodies into a person's bloodstream
pathogen a germ that causes disease
bacteria single-celled microorganisms
toxins poisonous substances
immune system the system that removes harmful organisms from the blood and combats pathogens
Rickettsia intracellular parasites that are classified as bacteria
fungi a pathogen that includes single- or multi-celled parasitic organisms
virus one of the smallest known pathogens
protozoa tiny, single-celled organisms that produce toxins that cause disease
helminth a parasitic worm
Created by: username0325



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