But go ahead and thumb through your dict ionary and see how many more words it in dic ates have this useful root! 1  dictionary: tells how to âsayâ words. 2  addict : âspeaksâ heavily towards something. 3  predict : âsayâ beforehand. 4  contradict : âsayâ against.
Neurotransmitters: Exciting and Inhibiting. Gamma-Amino-Butyric-Acid, or GABA, is the chief inhibitory neurotransmitter in the human brain. Along with serotonin, dopamine, glutamate, glycine, histamine, and norepinephrine, among dozens of other neurotransmitters, GABA regulates brain function.eurotransmitters: Exciting and Inhibiting. Gamma-Amino-Butyric-Acid, or GABA, is the chief inhibitory neurotransmitter in the human brain. Along with serotonin, dopamine, glutamate, glycine, histamine, and norepinephrine, among dozens of other neurotransmitters, GABA regulates brain function.
Increasing GABA at the neuronal synapse inhibits the generation of the action potential of the neuron, thereby making it less likely to excite nearby neurons. A single neuron may have thousands of other neurons synapsing onto it. Some of these release activating (or depolarizing) neurotransmitters; others release inhibitory (or hyperpolarizing) neurotransmitters. GABA is the primary inhibitory neurotransmitter, which means it decreases the neuron's action potential. When the action potential drops below a certain level, known as the threshold potential, the neuron will not generate action potentials and thus not excite nearby neurons.