bio
- Created by: hattie townsend
- Created on: 08-03-16 18:39
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- B1.1 - Keeping Healthy
- Defence Against Infectious Diseases
- Microorganisms that cause infectious diseases are called pathogens
- Two main types of pathogens: BACTERIA and VIRUS
- WHITE BLOOD CELLS help defend against pathogens by: ingesting pathogens, producing antitoxins to neutralise toxins, produce antibodies to destroy particular pathogens
- BACTERIA: are very small, they reproduce rapidly, may produce toxins that make you feel ill and can cause illness such as tuberculosis, cholera and tetanus
- VIRUSES: are smaller than bacteria, reproduce rapidly, may produce toxins that make you feel ill and cause illnesses such as the flu, colds etc.
- Microorganisms that cause infectious diseases are called pathogens
- Immunity and Vaccinations
- When white blood cells produce specific antibodies to kill a pathogen, it leads to immunity.
- White blood cells will recognise the pathogen if it comes back
- Steps of vaccination
- 1) small amounts of a dead pathogen are injected
- 2) white blood cells produce antibodies to destroy the pathogen
- 3) you then have an acquired immunity to this pathogen because the white blood cells sensitised to it
- Preventing Disease
- washing their hands before dealing with a patient
- Semmelweiss recognised how important it was to be hygienic
- Defence Against Infectious Diseases
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