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AQA Biology
Non-Specific Defence Systems
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Non-specific defence system
The body's first line of defence against
pathogens
, preventing them from entering the body
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Parts of the non-specific defence system
Skin
Nose and mucus
Cilia in trachea and bronchi
Stomach acid
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Skin
Protective
layer covering the body
Outer layer of
dead
cells difficult for
pathogens
to penetrate
Produces
sebum
to kill
bacteria
Can
scab
over when damaged
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Nose and mucus
Contract
pathogens
before they enter the
breathing
system
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Cilia in trachea and bronchi
Covered in
mucus
Contract pathogens
upwards
towards the
throat
to be swallowed
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Stomach acid
Kills
pathogens
before they can enter the
digestive
system further
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Even with the nonspecific defense systems,
pathogens
can still get into the human body and cause serious disease, so the
immune system
also protects us
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