synaptic transmission

• transmission between / within neurons

  within = electrically transmitted

  between = chemically transmitted
• what happens when electrical impulse reaches end of neuron?

  it triggers the release of neurotransmitters from vesicles
• what happens after neurotransmitter diffuses across synapse?

  -neurotransmitter binds to receptor on post synaptic neuron

  -on dendrites of next neuron

  -triggers next action potential (electrical impulse)
• what do the enzymes do?

  -released to break down neurotransmitters

  -excess neurotransmitter taken up by presynaptic neuron

  -vesicles replenished with new & reused neurotransmitter

  -ready for process again