Acetylcholine acts as one of these chemicals that pass nerve impulses across synapses
The acetylcholine diffuses across the synaptic cleft and fuses with the receptor
... [DOC] [TLE] Ch.5: Synaptic Activity [PAR] At a chemical synapse, the arrival of a nerve impulse at the endfoot of an axon ... 
usually one-directional, from the endfoot, or presynaptic element, across the 
synaptic cleft, ...