Phagocyte - White blood cell that engulfs and destroys a pathogen, Lymphocyte - White blood cell that produces an antibody, Antigen - Molecule on the surface of a pathogen that causes an immune response, Pathogen - A disease causing organism, Skin - A physical barrier that prevents pathogens from entering, Acid - A chemical that destroys pathogens in the stomach, Mucus - A substance that traps pathogens in the air way, Lysozyme - An enzyme found in tears that breaks down bacteria, Platelets - Component of the blood allow it to clot, Memory cells - Cells that remain in circulation and respond rapidly if you are infected by the same pathogen,

IGCSE Defence against disease

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