Incase pathogens get past the body's defence mechanisms.
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How does your breathing system stop pathogens infecting your body every time you breathe in?
The Breathing System produces sticky liquid called mucus. This mucus covers the lining of your lungs and tubes. It traps the pathogens and then they are disposed of.
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How does your body respond if the skin is broken?
Your blood quickly forms a clot which dries into a scab. The scab forms a seal over the cut, stopping pathogens getting through.
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How does your skin help prevent you from getting infectious diseases?
It prevents bacteria and viruses from reaching the tissues beneath that can be infected.
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Give another route that some pathogens use to infect humans.
Pathogens can enter your body through cuts, scratches and needle punctures.
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How can contaminated food make you ill?
By taking large numbers of microorganisms straight into your gut.
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Give an example of an infection spread by direct contact?
Impetigo and Genital Herpes
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What is direct contact?
Diseases spread of direct contact of the skin.
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Give an example of an infection spread by droplet infection?
Influenza and Tuberculosis
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What is a droplet infection?
When you cough, sneeze or talk you expel tiny droplets full of pathogens from your breathing system.
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What two things cause these symptoms?
The damage and toxins produced by the pathogens, The way your body responds to the damage and toxins
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What are common symptoms of infectious diseases?
High temperature, Headaches, Rashes
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How do viruses reproduce?
Viruses take over the cells of your body as they reproduce damaging and destroying the cells. They rarely produce toxins
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What else do bacteria often produce which makes you ill?
They produce toxins which affect your body, sometimes they directly damage cells.
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How do Bacteria reproduce?
Bacteria split in two.
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What is the first thing pathogens do when they enter the body?
Once bacteria and viruses are inside your body they reproduce rapidly.
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What are viruses?
Viruses are smaller than bacteria. They usually have regular shapes. Viruses can cause diseases in every type of living organisms from people to bacteria.
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Are all bacteria pathogens?
No, however some bacteria cause disease, many are harmless and some are really useful to us.
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What are bacteria?
Bacteria are single-celled living organisms that are much smaller than animal or plant cells.
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What are the two most common groups of pathogens?
Bacteria and Viruses
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What is a pathogen?
Microorganisms which cause disease.
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What is meant by infectious?
People can pass there microorganisms from one person to another.
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How is an infectious disease caused?
It's caused by a microorganism entering and attacking your body.
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Other cards in this set
Card 2
Front
What are the main soldiers of the immune system?
Back
White blood cells
Card 3
Front
What three ways can these cells protect you against disease?
Back
Card 4
Front
Why does the body need an immune system?
Back
Card 5
Front
How does your breathing system stop pathogens infecting your body every time you breathe in?
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