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Control and Regulation
Block 3
second line of defence
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Loz
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Cards (9)
An
infection
occurs when
pathogens
make it past the first line of defence and enter the body
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Second line of defence
The
immune system
responds in some general ways that treat all
pathogens
equally
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General responses to infection
Trigger an increase in
core body temperature
to produce a
fever
Trigger
inflammation
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Fever
An increase in core body temperature above
38°C
, usually accompanied by
shivering
and sweating
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A high temperature slows down or even kills some
pathogens
and speeds up the processes that help the
immune system
deal with the threat
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Inflammation
Painful redness and swelling around the site of an infection, caused by more
blood
being directed to that part of the body which contains
white blood cells
specialized to fight off pathogens
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Phagocytes
White blood cells
that
destroy
anything they don't recognize as part of the body by swallowing or engulfing it
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Pus
When
dead white blood cells
build up at the site of a
wound
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Snot
Turns
yellow
when it contains large amounts of
dead white cells
, a sign that the body is fighting a respiratory infection
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