B1 - Keeping Healthy

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  • Created by: Emily H
  • Created on: 22-04-13 21:03
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  • Biology 1 - Keeping Healthy
    • Diet  & Exercise
      • Eat a Balanced diet
        • Carbs
        • Proteins
        • Fats
        • Vitamins & Minerals
        • Fibre
        • Water
      • Men and Pregnant women need the most energy.
      • Metabolic Rate
        • Men have a higher metabolic rate than women
        • Exercise increases your metabolic rate
    • Weight Problems
      • Excess energy is stored as fat
        • This can lead to Arthritis, Type 2 Diabetes and Heart Disease.
      • Lose weight by reducing the energy intake and increasing the amount of exercise done.
      • Malnourishedpeople can develop serious health problems
    • Inheritance, exercise & health
      • Metabolic rate and Choleterol levels are inherited
      • Exercise increases health
        • Reduces weight
        • Increases metabolic rate
        • Reduces cholesterol
    • Pathogens & Disease
      • Bacteria and Viruses which cause diseases are Pathogens
        • They reproduce inside the body. Bacteria produce toxins
      • Ignaz Semmelweis realised diseases were being passed on by doctors.
        • Nobody believed him
        • MRSA is a n antibiotic resistant disease common in hospitals
    • Defence Mechanisms
      • Patogens can be spread:
        • Droplet infection
        • Direct contct
        • Food and Drink
        • Breaks in the skin
      • Prevent microbes getting in
      • White blood cells (p. 33)
        • Ingestion
        • Antibodies
        • Antitoxins
    • Using Drugs to Treat Disease
      • Painkillers do not cure illnesses, only relieve the symptoms
      • Antibiotics kill bacteria inside the body, but do not harm viruses
      • Alexander Flemming discovered Penicillin
        • Mould on culture plates killed the bacteria around them
      • Crocodiles, fish and honey are being studied to produce new medecines.
    • Growing and Investigating Bacteria
      • Sterilised Petri dishes, Agar jelly and inoculating rings are used to culture microorganisms
      • Incubated at 25oC to reduce the likelihood of harmful bacteria rowing
    • Changing Pathogens
      • When some pathogens are treated with antibiotics, some mutate to become resistant to that medecine.
        • They then  reproduce to create a resistant strain
      • MRSA developped from over-use of antibiotics. It causes a large number of deaths in hospitals
    • Immunity
      • Small amounts of dead or inactive pathogens are introduced to the body. White blood cells produce an antibody and remember it if the pathogen returns
      • Vaccines have small risks, so many people decide not to have their children vaccinated


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