synapses

• step 1

  electrical impulse arrives at the axon terminal
• step 2

  causes the vesicle containing neurotransmitters to start moving towards the presynaptic membrane
• step 3

  this causes the vesicles to fuse with the presynaptic membrane releasing their contents into the synaptic gap
• step 4

  neurotransmitters diffuse across the synaptic gap
• step 5

  neurotransmitters can bind to receptors on the post synaptic membrane