The second and third line of defence

Gap-fill exercise

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The body has many to stop microbes getting in.
But sometimes pathogens do get past this first line of .
Once inside the microbes have to be
The blood cells do this.
There are types of white blood cell that destroy microbes.
are cells which travel round the body and ingest (eat) the pathogens
The pathogens are also called .
are cells which recognise what type of pathogen is attacking the body.
They make special chemicals called which stick to the antigen so that the phagocytes can then eat them.