1. neurotransmitter molecules are contained in synaptic vessicles
2. only one cell has receptors
3. synapses
   1. the region of communication between neurons
   2. electrical synapse
      1. current passes directly from one neuron to next
      2. the recieving neuron is stimulated quickly at the same frequency
   3. chemical synapse
      1. current has to stop at synaptic terminal
      2. current is not transmitted from cell to cell
      3. information is transmitted
   4. synaptic cleft
      1. only in chemical synapses
      2. small space between recieving and transmitting neuron
      3. when current reaches here
         1. signal is converted
         2. converted into chemical signal
            1. neurotransmitter
            2. chemical signal will generate an action potential in recieving cell
4. chemical synapse
   1. action potential arrives at the synaptic terminal
   2. the arrived action potential triggers chemical changes that cause some of the vessicles to fuse with the plasma membrane of the cell their in
   3. neurotransmitters are released into the synaptic cleft by exocytosis
   4. in some cases the neurotransmitters bind to receptors in the recieving cell
   5. the binding of neurotransmitters opens chemically gated ion channels, when open ions can diffuse into the recieving cell
   6. neurotransmitter is broken down or sent back to signalling cell
   7. differs in each chemical synapse