Synaptic transmission

  • Synaptic transmission:
  • AO1: 
  • A synapse -  each neuron is separated from the next by a tiny gap called the synapse. 
  • Signals within neurons are transmitted electrically; however, signals between neurons are transmitted chemically across the synapse. When the electrical impulse reaches the end of the neuron (the presynaptic terminal) it triggers the release of neurotransmitter from tiny sacs called synaptic vesicles.
  • Once the neurotransmitter closes the gap, it is taken up by the postsynaptic receprot site on the next neuron. 
  • The chemical message is converted back into an electrical impulse and the process of electric transmission begins.
  • Neurotransmitters:
  • Neurotransmitters are chemicals that diffuse across the synapse to the next neuron in the chain.
  • Several dozen neurotransmitters have been identified. Each has its own specific molecular structure


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