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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.

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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

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

Each T helper marks each type of pathogen

They mark each pathogen and give signals for other cells

T helper cells are like bosses

cytotoxic t cells
Cytotoxic T Cells

They punch holes in the walls of pathogen cells so the contents ooze out

These are the killer cells

macrophages
Macrophages

Means ‘big eater’

These cells clean up the mess of dead cells

dendritic cells
Dendritic Cells

These are like spies

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

b cells
B Cells

They produce antibodies which lock onto the antigen of invading bacteria

suppressor t cells
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