The Nervous System

Sense
1. Sight
  1. Smell
    1. Hearing
      1. Touch
        Taste
Stimulus
1. Light
  1. Chemicals in air
    1. Vibration of air particles
      1. Heat & Pressure
        Chemicals in food
Preceptor
1. Eye
  1. Nose
    1. Ear
      1. Skin
        Tongue
Conscious action:We must think about it, involves the brain (Picking up a £20 note on the floor)
Reflex action: doesn't involve brain, only uses central nervous system (Moving hand if touched a hot plate)
1. Rapid
2. Automatic
3. Protective
Neurone-The pathway an impulse follows 'the nerves'
1. Receptor- What you are responding to the stimulas
  1. Stimulas-What you are responding to
    1. Response-The action you do
      1. Effector-What brings about the response
        Synapse-The gap between neurones
Stimulas (Stimulates) > Receptor (Sensory Neurone)(Electrical impulses) > Central Nervous System (Relay Neurone)(Neurotransmitter (gas) produced and diffuses across synapse)(Only important) > (Motor Neurone) Effector > Response
1. E.g Iris dilating/Contracting: Stimulus (Light) > Receptor (Eye) > Co-Ordinator (CNS) > Effector (Muscles in the iris) > Response (Iris dilating)
Eye: Cornea - Clear layer to protect inside of the eye
1. Lens - Focuses light onto the retina
  1. Retina - Detects the light
    1. Optic nerve - Connection from eye to brain
      1. Sclera - Protects inside of the eye (white)
        Iris - The muscles that control the site of the pupil to let more or less light in
        Pupil - Entrance to the eye for light. Size is determined by the iris
CNS VS. NS
1. CNS
2. CNS & NS
  1. Spinal Cord
    1. Neurones
3. NS
  1. Brain

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The Nervous System

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	Created by Scott Church over 11 years ago