Health and disease

Cards (27)

  • Health
    The complete social, physical and mental well-being of a person
  • Disease
    Any change in the normal function of a part of the body
  • Types of diseases
    • Communicable
    • Non-communicable
  • Communicable diseases
    Can be spread from person to person
  • Non-communicable diseases
    Cannot be spread from person to person, mainly caused by lifestyle or genetics
  • Causes of communicable diseases
    • Pathogens (microorganisms that can cause disease)
    • Bacteria (e.g. cholera, tuberculosis)
    • Fungi (e.g. chlora diet ashbach)
    • Protists (e.g. malaria)
    • Viruses (e.g. HIV, chlamydia)
  • Vectors
    Something that has the disease and spreads it onto something else (e.g. mosquitoes for malaria)
  • Viruses
    Pathogens made up of genetic material (DNA or RNA) surrounded by a protein coat
  • Lytic pathway of virus replication
    1. Virus inserts genetic material into cell
    2. Virus uses cell parts to make new viruses
    3. Cell lyses (explodes) releasing new viruses
  • Lysogenic pathway of virus replication
    1. Virus inserts genetic material into cell's DNA
    2. Virus genetic material replicates as cell divides
    3. Trigger causes virus to enter lytic cycle
  • Barriers to pathogens in the human body
    • Physical barriers (skin, mucus, cilia)
    • Chemical barriers (stomach acid, lysozyme)
  • Types of white blood cells
    • Phagocytes (engulf pathogens)
    • Lymphocytes (produce antibodies)
  • Antigens
    Flags on cells that identify them as belonging to the body
  • Antibodies
    Produced by lymphocytes to bind to and destroy pathogens
  • Vaccines
    Contain dead or weakened pathogens to stimulate an immune response
  • Monoclonal antibodies
    Antibodies produced by hybridoma cells (fused lymphocyte and tumour cell)
  • Uses of monoclonal antibodies
    • Pregnancy tests
    • Tumour detection
  • Drug development process
    1. Pre-clinical trials (testing on human tissue, animals)
    2. Clinical trials (testing on healthy humans, ill humans, large trials)
  • Efficacy
    How well a drug works
  • Toxicity
    Side effects of a drug
  • Causes of non-communicable diseases
    • Lifestyle choices (e.g. obesity, smoking)
    • Genetics
  • BMI (Body Mass Index)

    Measure of obesity calculated as mass divided by height squared
  • Waist to hip ratio
    Measure of abdominal obesity calculated as waist measurement divided by hip measurement
  • Smoking
    Leads to fatty buildup in arteries, restricting blood flow and causing cardiovascular disease
  • Cardiovascular disease (CVD)

    Problems with the heart or blood vessels
  • Treatments for CVD
    • Stents
    • Statins
  • Plant defences

    • Waxy cuticle on leaves
    • Cell walls