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  • Microbes & Pathogens (Part 2)
    • Diseases
      • Some diseases are not caused by pathogens and so are not infectious.
        • Scurvy is caused by vitamin C deficiency.
        • Anaemia is caused by iron deficiency
        • Diabetes and cancer are disorders of the body
        • Some diseases are inherited, such as red-green coour vision deficency
    • Cancer
      • A cancer happens when cells begin to divide out of control. They form tumours that can sometimes be felt with an unusual lump in the body. Diet and lifestyle can increase the risk of developing certain cancers.
        • Smoking increases the risk of lung cancer
        • Using sunscreen reduces the risk of skin cancer
        • Eating more fruit and vegetables can reduce the risk of bowel cancer
        • Tumours grow slowly and harmless- warts are benign tumours
        • Malignant tumours often grow more quickly and spread throughout the body
    • Parasites
      • Parasites are organisms that live on or in a host organism. The parasite benefits from this arrangement but the host suffers as a result.
      • For example tapeworms are parasites, they live inside another animal, attaching themselves to the host's gut and absorbing its food.
        • The person who has parasites lose nutrition and may develop weight loss diarrhoea and vomiting. People do not usually die from this but will cut off their food supply.
    • Malaria
      • Malaria is a diseased caused by protozoan which is a type of single-celled organism
        • The malaria parasite is spread from person to person by mosquitoes. They feed on blood and the malaria is passed on when the mosquito takes blood.
        • Organisms that spread diseases, rather than causing it themselves are called vectors. A mosquito is the vector for malaria.


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