ONLINE SUBSTITUTE CERTIFICATE APPLICATION. 1  You will first need to create a profile in our certification system. 2  After you have created a profile in our certification system, find the applications link in the menu on the left hand side of the screen to see a list of application types.
Neurotransmitters and Neuroactive Peptides. Communication of information between neurons is accomplished by movement of chemicals across a small gap called the synapse. Chemicals, called neurotransmitters, are released from one neuron at the presynaptic nerve terminal.ommunication of information between neurons is accomplished by movement of chemicals across a small gap called the synapse.
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.