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

T helper cells are like bossesThey mark each pathogen and give signals for other cells

Each T helper marks each type of pathogen

Cytotoxic T Cells

These are the killer cellsThey punch holes in the walls of pathogen cells so the contents ooze out

Macrophages

Means ‘big eater’

These cells clean up the mess of dead cells

Dendritic CellsThese are like spies

If they find an invading pathogen they bring back evidence to the T

helper cells

B CellsThey 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

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