When they enter the body,
they release toxins that
make humans feel ill.
Fungi
Larger fungi include
moulds and mushrooms
Viruses
Genetic material inside a
coat of protein.
Passed through bloodstream.
Disease-Causing Microbe
Parasites
Can cause disease in humans
White Blood Cells
Produce antibodies to
destroy pathogens
Bought in when first line of
defence is broken
Type 1: Surrounds and digests the microbes
Types 2: Produces chemicals called
antitoxins
Type 3: Produces chemicals
called antitoxins, which
neutralise poisons (toxins)
Type 4: White Blood Cells produce
another type of White Blood Cell called a
memory cell, this usually means that you
rarely get the disease again as the
antibodies are produced quicker.
NOTE
Pathogens are not the disease, they CAUSE the disease.
The period between when the person becomes
infected and when the symptoms of the disease start
to show is called the INCUBATION PERIOD
First line of defence is the SKIN
When you cut or graze yourself the skin is broken so now
the microbes can enter the blood, to prevent this the
blood will clot, dry and go hard. This forms a SCAB
Micro-Organisms
Types: Virus, Bacteria, Fungi and Parasite
Killing Micorbes
Disinfectants work by killing the microbes ,
they can kill living cells so they shouldn't
come in contact with human tissue.
Antiseptics can be used on human tissue
because they stop the microbes growing,
some antiseptics are weakened forms of
disinfectants.
Vaccinations
Weakened form of the disease
Given as an injection
or as a drink (polio)
When the vaccine enters the body it triggers the
immune system to respond, white blood cells
produce antibodies to attack the microbe. The
body now has defence against the microbe:
Antibodies/ Special White Blood Cells called
Memory Cells. If microbe then attacks the body
then the memory cells produce antibodies to
attack it quickly.