They modulate pre-synaptic terminal Ca⁺⁺ levels in opposite ways

They modulate whether neurotransmitter is produced in the pre-synaptic terminal  or in the cell body

They modulate in different ways the way in which neurotransmitter is packaged into vesicles

They modulate in different ways the way in which neurotransmitter is produced in the pre-synaptic terminal 

They cause vesicles in the pre-synaptic terminal vesicles to fuse with the membrane in different ways

synaptic cleft

dendrites

axon hillock

along the axon

cell body

a hyperpolarization of the RMP via 2nd messengers and G proteins

a hyperpolarization of the RMP via ion channels that are receptors or linked to G proteins but not linked to 2nd messengers

a hyperpolarization of the RMP via 2nd messengers and ion channels

a hyperpolarization of the RMP via 2nd messengers but not G proteins

a hyperpolarization of the RMP via ion channels that are receptors or linked to G proteins

Depending on whether they are elicited by receptors that produce fast changes or receptors that produce slow changes

Depending on whether they are elicited by excitatory or inhibitory synapses

Depending on whether they are elicited by receptors that are ion channels or receptors linked to G proteins

Depending on the direction of change in the post-synaptic potential

Depending on the mechanism producing the change in the post-synaptic potential

caused by the influx of any ion

caused by the net closure of voltage-gated ion channels

caused by the net opening of voltage-gated ion channels

caused by the net influx of positively charged ions

caused by the net efflux of positively-charged ions

maintains the same amount of current to depolarise other regions of the post-synaptic neuron

decreases the likelihood of the post-synaptic neuron producing an AP

maintains the resting membrane potential of the post-synaptic neuron

does not decay with distance from the synapse

is a change in resting membrane potential of the post-synaptic neuron