Human Defence System

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  • Created by: leah.cm
  • Created on: 06-02-23 17:20
The skin
● Acts as a physical barrier
● It produces antimicrobial secretions to kill pathogens
● Good microorganisms known as skin flora compete with the bad
microorganisms for space and nutrients
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The nose
● Has hairs and mucus which prevent particles from
entering your lungs
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The trachea and bronchi
● Secrete mucus in order to trap pathogens
● Cilia to waft mucus upwards so it can be
swallowed
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The stomach
● Produces hydrochloric acid that kills any pathogens in your mucus, or food
and drink
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Phagocytosis (engulfing
and consuming
pathogens)
This destroys them, meaning they can no longer make you feel ill.
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Producing antibodies
Each pathogen has an antigen on their surface,
If you become infected again with the same pathogen, the specific complementary antibodies will be produced at a faster rate.
The individual will not feel the symptoms of the illness.
They are said to be i
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Producing antitoxins
They neutralise the toxins released by the pathogen by binding to them.
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Other cards in this set

Card 2

Front

The nose

Back

● Has hairs and mucus which prevent particles from
entering your lungs

Card 3

Front

The trachea and bronchi

Back

Preview of the front of card 3

Card 4

Front

The stomach

Back

Preview of the front of card 4

Card 5

Front

Phagocytosis (engulfing
and consuming
pathogens)

Back

Preview of the front of card 5
View more cards

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