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synapse. the junction between the processes of two neurons or between a neuron and an effector organ, where neural impulses are transmitted by chemical means. The impulse causes the release of a neurotransmitter (e.g. acetylcholine or norepinephrine) from the presynaptic membrane of the axon terminal.ynapse. SYNAPSE: Axon terminal synapse. The space between the junction of two neurons in a neural pathway, where the termination of the axon of one neuron comes into close proximity with the cell body or dendrites of another.
At gap junctions, such cells approach within about 3.5 nm of each other, a much shorter distance than the 20- to 40-nanometer distance that separates cells at chemical synapse. In many animals, electrical synapse-based systems co-exist with chemical synapses.Compared to chemical synapses, electrical synapses conduct nerve impulses faster, but, unlike chemical synapses, they lack gain âthe signal in the postsynaptic neuron is the same or smaller than that of the originating neuron.n important characteristic of electrical synapses is that, most of the time, they are bidirectional (allow impulse transmission in either direction). However, some gap junctions do restrict communication to only one direction.