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The Second Line Of Defence Rachel Payne If the first line of defence, the skin fails, there is a secondary line of defence to protect your body These are made up of different types of white blood cells Neutrophils Neutrophils attack bacteria They are like soldiers on a battlefield that rush to the enemy but get killed easily They develop in bone marrow and only live a few days before self-destructing T Helper Cells Each TThelper Theymarks mark each pathogen type of pathogen helper cells are like bosses and give signals for other cells Cytotoxic T Cells TheyThese punchare holes the cells walls of theinkiller pathogen cells so the contents ooze out Macrophages Means ‘big eater’ These cells clean up the mess of dead cells Dendritic Cells These are like spies If they find an invading pathogen they bring back evidence to the T helper cells B Cells They produce antibodies which lock onto the antigen of invading bacteria Suppressor T Cells Once the infection is gone, the white blood cells need to calm down to prevent getting damaged. The suppressor cells slow down or turn off the immune system Thankyou for watching my slideshow