Zusammenfassung der Ressource
Preventing and
Fighting Disease
- Natural Defence System
- Skin
- Acts as barrier for pathogens
and secretes antimicrobal
substances
- Hairs and mucus in the nose
- Hair traps pathogen
that have been
breathed in, in mucus in
the nostrils
- Trachea and Bronchi
- Secrete mucus to trap
pathogens
- Lined with cilia (hair like
projections).
- Waft mucus up to the
back of the throat
where it can be
swallowed
- Stomach
- Produces hydrchloric acid which kills
pathogens that make it far from the
mouth
- Preventing the Spread of Disease
- Being hygeinic
- E.g. washing hands before
preparing food or after
sneezing
- Destroying vectors
- Vectors that are insects can be killed
using insecticides or by destroying
their habitat so they can no longer
breed.
- Isolating Infected Individuals
- Vaccination
- People who have been vaccinated
cannot develop the infection and then
pass it on to someone else.
- Immune System/White Blood Cells
- Consuming/engulfing pathogens
- Called PHAGOCYTOSIS
- Producing Antibodies
- Every pathogen has
unique antigens on its
surface.
- White blood cells
produce antibodies to
lock onto this specific
antigen.
- Antibodies are then
produced rapidly and
carried around the
body to find all similar
bacteria or viruses.
- If the same pathogen enters the
body again, the white blood cells
will rapidly produce the correct
antibodies to kill it.
- Producing antitoxins
- Antitoxins counteract the toxins
produced by invading the bacteria