Neurones and Receptors

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  • Created by: Sarah
  • Created on: 26-01-15 13:11
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  • Neuronal system
    • Sensory Receptors
      • Pressure
        • pacinian corpulscles in the skin
      • Sight
        • rods and cones in the retina
      • Smell
        • olfactory cells in the nose
      • Taste
        • taste buds in the tongue
      • Sound
        • receptors in the inner ear
      • Muscle movement
        • proprioreceptors
      • they convert energy from one form to another
        • detect the STIMULUS and convert it into a NERVE IMPULSE
    • Resting potential
      • -60mV
      • more negative inside the axon
      • maintained by sodium potassium pumps
      • POLARISED
        • has a potential difference across the membrane
      • 3Na OUT     2K IN
    • Generator Potential
      • (1) Stimulus occurs
      • (2) Gated Na channels open
      • (3) a FEW Na ions move in
      • (4) small depolarisation
    • Neurones
      • Sensory neurones
        • receptor --> CNS
        • long dendrons
        • cell body just outside the CNS
        • short axon
      • Relay neurones
        • sensory neurones --> motor neurones
      • Motor neurones
        • CNS --> Effector
        • cell body IN the CNS
        • long axon
      • long = transmit over a long distance
      • gated sodium channels
      • sodium - potassium pumps
      • insultating schann cells (myelin sheath)
      • cell body containing the nucleus, mitochondria and ribosomes
  • Sensory neurones
    • receptor --> CNS
    • long dendrons
    • cell body just outside the CNS
    • short axon

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