6.5 Neurons and synapses

HideShow resource information
View mindmap
  • 6.5 Neurons and Synapses
    • Neurons
      • individual cells that transmit electrical impulses
      • nerves are bundles of neurons
      • CENTRAL NERVOUS SYSTEM -- brain & spinal cord
      • 3 types of neurons
        • MOTOR
        • SENSORY
        • RELAY
    • IMPULSE
      • Resting potential
        • Na+ pumped out of axon by active transport
        • K+ pumped into axon
        • - charged proteins remain inside
        • Cytoplasm negative charge
        • area outside axon has + charge
        • 70mV
      • Depolarisation
        • when impulse reaches axon, sodium channels open letting Na+ diffuse into axon
        • Na+ movement passive
        • +30mV
      • Repolarisation
        • Na+ channels close
        • K+ channels open
    • Saltatory conduction
      • occurs in myelinated axons
      • myelin sheath acts as insulator
    • Synapses
      • Junctions between neurons
      • Information passed between neurons by neurotransmitters

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Cellular processes and structure resources »