So, in this diagram, we actually have two neurons. This is known as the presynaptic neuron, and this is known as the postsynaptic neuron. And so the question is, how can we actually generate an action potential on this membrane of the post synaptic nerve cell? And to begin, let's actually look at this axon terminal of the presynaptic nerve cell. So along the axon HALOCK of this presynaptic nerve cell, an action potential is generated. And that action potential propagates all the way to the axon terminal of this cell.