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  • Homeostasis
    • Synapses and Reflexes
      • The connection between two neurones is called a synapse.
        • The nerve signal is transferred by chemicals which diffuse across the gap
          • These chemicals then set off a new electrical signal in the next neurones.
      • Reflexes help prevent injury. They are fast, automatic responses that don't require conscious thought.
        • The passage of information from a receptor to a reflector is called a reflex arc.
          • Response
    • When the level of something (eg temperature blood glucose) gets too high or too low, negative brings it back to the normal level.
    • The Brain
      • It's made up of four main regions.
        • Cerebral Cortex (consciousness, intelligence, memory, language)
        • Medulla (unconscious activities)
        • Cerebellum (Muscle coordination)
      • Methods to study the brain
        • Patients with brain damage
        • Electrical stimulation
        • MRI Scans
    • The Eye
      • Parts of the Eye
        • Sclera (tough supporting wall)
        • Cornea (transparent outer layer at the front of the eye)
        • Iris (controls the diameter of the pupil)
        • Lens (focuses the light into the retina)
        • Retina (contains receptor cells sensitive to light intensity and colour)
    • The Endocrine System
      • Hormones are chemical messengers sent in the blood.
      • Glands that release some hormones:
        • Ovaries
        • Testes
        • Pituitary Gland
        • Thyroid
        • Adrenal Gland
        • Pancreas
  • Stimulus
    • Receptor
      • Sensory Neurone
        • CNS
          • Motor Neurone
            • Effector
              • Response


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