Transcript How does your body defend itself against microbes?

How does your body defend itself
against microbes?
Today we are learning:
• About the natural barriers we
have to fight infection
• That we make antibodies and
specialised cells in the blood to
fight microbes
Keywords:
Hygiene, immunity,
vaccination, antibodies.
Starter:
Complete your wordsearch
of keywords
Extension:
What happens to your body
when you catch a cold?
Discuss in pairs.
Edward Jenner
Many years ago there was a
disease called SMALLPOX,
people living in the
countryside noticed that
milkmaids never seemed to
catch the deadly disease.
This was because they were
subjected to another similar
infection caught from the
cows they milked (cowpox).
Edward Jenner
Edward Jenner
In 1796 a doctor called
Edward Jenner carried out
a famous experiment on an
eight year old boy called
James Phipps.
Edward Jenner
Jenner took pus from
someone with mild cowpox
and put it into a cut in the
eight year olds arm.
He never caught smallpox,
for many years after that
Jenner conducted lots of
experiments to prove that our
bodies can become
IMMUNE.
How does your body defend itself?
How does your body defend itself?
Our bodies have many defence mechanisms against invading
microbes:
Tears contain an
enzyme that kills
The skin acts
bacteria
as a barrier
Stomach produces
stomach acid
If our skin is cut
platelets seal the
wound by clotting
The breathing
organs produce
mucus to cover the
lining of these
organs and trap the
microbes
How does your body defend itself?
Ear wax traps them
On your outline
of the human
body, label how
we stop microorganisms
getting into
our bodies.
Here is an
example for
you.
Next lesson…
We are going to
look at how we can
kill bacterial.
We need to grow
some bacteria to
look at next lesson.
Listen carefully to
your instructions
and make sure you
wear goggles!
End of lesson quiz
Turn to the back of your book and put 1 to 10 in the margin.
The questions will pop up, answer them as quickly as
possible.
Quiz questions
1. Name the 3 main types of microbes
2.
Which organ uses acid to kill microbes?
3.
What do white blood cells make to fight microbes?
4.
Name the doctor that experimented with smallpox
5.
What does engulf mean?
5 correct
LEVEL 5
4 correct
LEVEL 4
2-3 correct LEVEL 3
0-1 correct LEVEL 2