What is the Meaning & Definition of neurotransmitter

The neurotransmitter, also known as neuromediador, is a chemical whose main purpose is the transmission of information from one neuron to another to accross that referred to as synaptic space that separates two consecutive neurons. Anyway, information transmitting the neurotransmitter also can lead to other cells as being the muscle or glandular; It is a key element when it comes to the transmission of nerve stimuli. The neurotransmitter starts Act releasing at the end of a neuron, while developing the spread of the influence of nervous, looking at the precise points below neuron membrane. The neurotransmitter, in addition, you can consider it as a bio-molecule, synthesized by neurons in the majority of cases and which as we said above, from existing in pre neuron synaptic vesicles will be released through the synaptic space, finally determining a substantial change in the post synaptic neuron action potential. As a result of this situation neurotransmitters are the most important substances of the synapse.
The effect of the neurotransmitter can be exciting, if it depolarises the membrane, or in the absence of inhibitory, if it repolarizes it.
They are classified according to size, neurotransmitters of small size (amino acids) and neuropeptides, composed of more than 3 amino acids (vasopressin).
In neurotransmitters, it should be noted the existence of these actual sayings and moreover of neuromodulators. Rinse well worth because the latter act very similarly to the neurotransmitters, although they will differentiate these because its action is not limited to the synaptic space but spread through the fluid extraneuronal, intervening directly in the post synaptic consequences of the process of neurotransmission. Among these are: radical free, luteinizing, amicocidergicos, peptidergic, adrenergic and cholinergic.