Rather than$($a$.$ continuously b$.$ discretely$)$ flowing out of the presynaptic neuron, neurotransmitters are released in $($a$.$ a continuous fashion b$.$ discrete quanta$)$ or groups of neurotransmitter molecules, that all spilled into the $($a$.$ synaptic cleft $$b$.$ postsynaptic terminal$)$ in one go$,$ before they $($a$.$ Bind to receptors b$.$ flow to the post synaptic neuron$)$