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The Body s First Line of Defense - PowerPoint PPT Presentation


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The Body\'s Second Line of Defense. White Blood Cells: Helps fight infection.Lymphatic System: Filters undesirable pathogens out of the body.Liver: Filters blood and detoxifies poisons.Antibodies: Fights off pathogens.. How Diseases Are Spread. Direct contact.Contact with non-living objects: fence post, trucks.Infection from soil.Infection from food or water.Airborne infection.Infection from parasites: mosquitos, flies..

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