Biology B1 1.5 Defence mechanisms.

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What does the body prevent from getting in?
Pathogens.
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How does the body defend against pathogens that enter?
Pathogens can be destroyed by white blood cells, pathogens are also trapped by mucus and killed by stomach acid.
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What are white blood cells part of?
The immune system.
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What are the three ways that white blood cells defend the body against pathogens?
They ingest pathogens, they produce antibodies and they produce antitoxins.
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What does white blood cells ingest pathogens mean?
This means they digest and destroy them.
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How does the antibodies produced by white blood cells defend the body against pathogens?
They help to destroy particular pathogens.
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How do the antitoxins produced by white blood cells defend the body?
They counteract the toxins (poisons) that pathogens produce.
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How are pathogens prevented from entering the body?
The skin stops them (also mucus and stomach acid).
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How do white blood cells defend the body?
They ingest pathogens, produce antibodies and produce antitoxins.
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***LOOK UP DIAGRAM OF WHITE BLOOD CELLS DEFENDING THE BODY****
**INGESTING BACTERIA, MAKING ANTIBODIES AND MAKING ANTITOXINS****
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Card 2

Front

How does the body defend against pathogens that enter?

Back

Pathogens can be destroyed by white blood cells, pathogens are also trapped by mucus and killed by stomach acid.

Card 3

Front

What are white blood cells part of?

Back

Preview of the front of card 3

Card 4

Front

What are the three ways that white blood cells defend the body against pathogens?

Back

Preview of the front of card 4

Card 5

Front

What does white blood cells ingest pathogens mean?

Back

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