AQA Biology [B1] Part 1

Health
1. Requires...
  1. Balanced diet
    1. Right nutrients
    2. Enough energy
      1. Metabolic rate varies
  2. Regular exercise
2. Inheritance
  1. High cholesterol levels
  2. Metabolic rate
3. Pathogens
  1. Cause disease
  2. Bacteria
    1. Antibiotics
      1. Kill bacteria
      2. Cannot destroy viruses
  3. Reproduce rapidly
    1. Produce toxins
  4. Viruses
    1. Reproduce inside cells
  5. Handwashing removes
  6. Destroyed
    1. White blood cells
      1. Engulf pathogens
      2. Produce antitoxins
      3. Produce antibodies
  7. Changing
    1. Mutation
      1. New strains
        Resistance to antibiotics
        Natural selection
        Pandemics
        Epidemics
4. Vaccination
  1. Vaccines
    1. Dead or inactive pathogens
    2. Immunise people
    3. White blood cells make antibodies
Control
1. Reflexes
  1. Fast and automatic
  2. Protect
  3. Receptors
    1. External stimuli
  4. Sensory neurons
  5. Motor neurons
  6. Impulse transmitted
    1. Across synapse
2. Hormones
  1. Menstrual cycle
    1. FSH
      1. Pituitary gland
      2. Egg to mature
      3. Oestrogen
        Stops FSH
        Stimulates LH
        Womb lining
  2. Controlling conditions
    1. Water content
    2. Ion change
    3. Temperature
    4. Blood sugar level
  3. Plants
    1. Auxin
      1. Shoots
        Towards light
        Phototropism
      2. Roots
        Towards gravity
        Gravitropism
  4. Control fertility
    1. Contraceptive pills
3. Drugs
  1. Medicines
    1. Tested in double blind trials
    2. Placebo
  2. Recreational drugs
    1. Damage brain
    2. Harmful and addictive

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AQA Biology [B1] Part 1

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