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After neurotransmitters are synthesized, they are packaged and stored in vesicles.
These vesicles are pooled together in terminal boutons of the presynaptic neuron.
Some neurons such as photoreceptor cells, for example, do not have myelinated axons that conduct action potentials.
Other unipolar neurons found in invertebrates do not even have distinguishing processes such as dendrites.
Cellular neuroscience is the study of neurons at a cellular level.
This includes morphology and physiological properties of single neurons.
Neurons are diverse with respect to morphology and function.
Such a process is also known as a positive feedback loop.Metabotropic receptors on the other hand activate second messenger cascade systems that result in the opening of ion channel located some place else on the same postsynaptic membrane.Although slower than ionotropic receptors that function as on-and-off switches, metabotropic receptors have the advantage of changing the cell's responsiveness to ions and other metabolites, examples being gamma amino-butyric acid (inhibitory transmitter), glutamic acid (excitatory transmitter), dopamine, norepinephrine, epinephrine, melanin, serotonin, melatonin, and substance P.In neuroscience, synaptic plasticity is the ability of synapses to strengthen or weaken over time, in response to increases or decreases in their activity.Since memories are postulated to be represented by vastly interconnected networks of synapses in the brain, synaptic plasticity is one of the important neurochemical foundations of learning and memory (see Hebbian theory).