Transcript The Second Line Of Defence

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
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