1. An ACTION POTENTIAL shoots down the AXON, away from the cell body.
2. A NEUROTRANSMITTER is release into the SYNAPSE, where the DENDRITES or the neighboring neurons detect it.
3. If there is a receptor for this neurotransmitter on the dendrites, the neurotransmitter and receptor bind, creating an electrochemical signal.
4. If that signal is strong enough, it spreads down the dendrites and across the cell body of the next neuron, and begins another action potential.