health and disease

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  • health and disease
    • the world health organisation defines health as 'a state of complete physical, mental and social wellbing'
    • types of diseases
      • Communicable
        • they can be passed from one person to another
        • rapid variation in number of cases over time
        • cases are often localised
        • e.g malaria, typhoid and cholera
      • non-communicable
        • not passed between person to person
        • number of cases only change gradually
        • cases may be more widely spread
        • e.g cancer, diabetes and heart disease
    • pathagens
      • when a few pathogens infect you they can produce rapidly
      • large numbers of pathogens make you ill
      • bacteria may release toxins that make you feel ill. some bacteria invade and destroy body cells
      • viruses take over a body cell's DNA causing the cell to make toxins or causing  damage when new viruses are released
      • fungi are eukaryotic organisms
      • protists are eukaryotic organisms. many are free living but some are pathogens


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