Biology Unit 2

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Define 'health'
A state of physical, mental and social well-being, which includes the absence of disease and infirmity.
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Define 'disease'
A condition that impairs the noraml functioning of an organism.
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What is a parasite?
an organism that lives on or in another organism (the host) and causes damage to that organism.
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What is a pathogen?
An organism that can cause damage to the organism it infects (the host).
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What is an immune response?
A response to an antigen which involves the activation of lymphocytes.
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What is an antigen?
A forgeign molecule that causes an immune response.
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What is an antibody?
A protein molecule released by the immune system in response to an antigen which can neutralise antigens.
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What does AIDS stand for?
Aquired Immune Deficiency Syndrome.
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What is AIDS caused by?
By human immunodeficiency virus.(HIV)
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What happens to a person who has AIDS?
Their immune system deteriorates and eventually fails due to the loss of white blood cells. It makes the sufferer more vulnerable to other infections, like pneumonia.
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What is Tuberculosis?
A lung diseases caused by the bacterium Mycobacterium tuberculosis.
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How does TB spread?
By 'droplet infection' - when an infected person coughs or sneezes, tiny dropelts of saliva and mucus containing the bacteria are released from their mouth and nose. These droplets are then breathered in by other people.
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How is Malaria caused?
By the parasite Plamodium which infects the liver and red blood cells. It's transmitted by mosquitoes/
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Name 3 ways Malaria, AIDS/HIV and TB have a global impact in developing countries.
1. Theres limited access to healthcare. 2. Theres limited health education to inform people how to avoid infectious diseases. There are overcrowded conditions.
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Name 3 reasons why studying the global distribution of diseases such as AIDS and TB is important?
1. The information can be used to find out where people are most at risk so aid can be provided there. 2.The data collected can be used to predict where epdiemics are most likely to occur. 3. Important for research into how it has spread etc.
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Card 2

Front

Define 'disease'

Back

A condition that impairs the noraml functioning of an organism.

Card 3

Front

What is a parasite?

Back

Preview of the front of card 3

Card 4

Front

What is a pathogen?

Back

Preview of the front of card 4

Card 5

Front

What is an immune response?

Back

Preview of the front of card 5
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