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  2.  
  3. PEARSON (PEARSON)
  4.  
  5. Applied Science 2010 QCF
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  7. Unit 43 - Diseases and Infections

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Unit 43 assignment 1

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  • March 21, 2019
  • 9
  • 2018/2019
  • Essay
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TASK 1

What is a disease?

This is simply a form of malfunction or even disorder of either the body or mind which leads to (or
can lead to) a decline of good health. There are different categories of diseases that are known.
These categories include:

Category Description of disease type Example & Description
1. Infectious diseases-
Caused by ‘foreign’
organisms such as
pathogens, which
invade the body.
Protozoa Known as microscopial 1. Malaria – a blood disease,
organisms, which are able to which is caused by
reciprocate in humans and ‘Plasmodium parasites’
therefore allowing them to and carried by anopheles
survive, as well as paving the mosquitos. When the
way for severe infections to parasites enter your body
occur, from just on single via bloodstream, they
organism. then travel to the liver,
where they reciprocate;
and then transported
back into red blood cells
where they infect and
damage them.
Bacterial A localised infection, which 1. Cholera –an infectious
stays in one place- however, disease caused by
reproduces and produces consuming contaminated
toxins. These toxins can harm food or water. Cholera
your tissues. causes watery diarrhoea.
As well as dehydration.
This is due to the
bacterium that cholera
carries, which is referred
to as ‘Vibrio cholera’.
Viral Viral infections ‘are made up of 1. Ebola- a life-threatening
genetic material inside of a viral infection classified by
protein coating’. Viruses are internal bleeding and also
classed as ‘tiny germs’. They the fact that it is spread
invade living cells by using by contact with infected
them to duplicate other viruses fluids.
like themselves. Since this kind 2. Smallpox – classified as
of infection spreads around the an acute contagious
body, it is referred to as disease caused by the
systemic. variola virus, which leave

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