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Immune system.

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Introduction

Essay-immune system Introduction: This is an essay on the human immune system. It is divided into four topics: microbes, catching a disease, preventing diseases and vaccinations. It will provide to you lots of information on how we live and how easily diseases can spread, which can lead to severe illnesses. So this will teach you more about how to fight them. Microbes: There are two different types of microbes: bacteria and viruses. Bacteria are very small living cells (about 1/100th the size of your body cells.) They can reproduce very rapidly inside your body. They can make you feel ill by damaging your cells and producing toxins. These are the bad effects; some bacteria can be useful in some places e.g. digestive system. Bacteria are cells with no nucleus. ...read more.

Middle

In flood conditions bacteria and viruses are spread in water. Water formed floods can also effect the water we drink and cook with (although bacteria dies in conditions less then five degrees and in conditions higher than sixty degrees). The water from rivers and streams disperse from their banks and carry their polluted water, which has travelled through muddy areas. The water is not purified and may be drunk by people. They are inserting millions of bacteria and viruses which make us ill. This increases the rate of disease in a town or a city. Modern city help to prevent diseases due to technology. Our food is stored in Fridges and freezers to prevent bacteria growing on food, our water is purified before we drink it and we have medicines near us to help cure diseases caused by bacteria and viruses. ...read more.

Conclusion

A vaccination will help build up an immunity to a disease as it injects dead micro-organisms into your bloodstream. This will mean that the white blood cells will act by producing antibodies against the micro-organisms even though they are dead, so when a live micro-organism attacks, the antibodies are more than ready to fight back! A few examples of types of diseases which can be vaccinated against are: whopping cough, tuberculosis (T.B), polio, meningitis and measles mumps rubella-(known as the MMR vaccine) Conclusion From this essay we have learnt a lot of new things. We have learnt how we catch and prevent diseases, so in the future we can stop them. We have also learnt exactly what viruses and bacteria do to your body. The most interesting fact we found was that you can never catch the same disease again, as your body becomes immune to it; this even involves a simple cold. We enjoyed and found this essay fascinating. ...read more.

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