Transcript Defence against Disease

28/03/2016
Defence against Disease
L.O: To understand how the body
defends itself against disease and
how diseases are transmitted
Starter:
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1. Look in your book from last lesson  revise
2. Name the 3 types of microbe and rank from
biggest to smallest
3. Add units for scale.
4. State one feature of each cell
5. Finally, list the ways that disease can be
transmitted (passed from one person to
another)
Microbes: our defence against them
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White blood cells :----------------------
1)
They eat the microbe
2)
They produce antibodies to neutralise the
microbe
3)
The produce antitoxins to neutralise the
poisons produced by microbes
The skin acts as a
barrier
Stomach produces
stomach acid
If our skin is cut platelets
seal the wound by
clotting
Tears contain an
enzymes that kills
bacteria
The breathing organs
produce mucus to cover
the lining of these organs
and trap the microbes
Fighting disease
NATURAL IMMUNITY
This is when antibodies are produced by a person
when needed or they are passed on by the mother
during pregnancy.
ARTIFICIAL IMMUNITY
A vaccine with dead microbes is injected – the body is
“tricked” into producing antibodies ready for the real thing.
This is called PASSIVE IMMUNISATION
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Using Antibiotics
Antibiotics can be used to kill bacteria. However, there are two problems:
1) Overuse of antibiotics can lead to bacteria
becoming resistant
2) Antibiotics have no effect on a virus, like the
common cold. A virus must be allowed to “run its
course”.
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WORD BINGO! Draw a 4x4 grid
Select some of these words to put in your grid in a
RANDOM order.
Yeast
White blood cell
Bread
Beer
fungus
Earwax
Chicken pox
stomach acid
engulf
quorn
virus
microbe
skin
food poisoning
tears
antibiotic
scabs
bacteria
infect
flu