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Gamma-aminobutyric acid (GABA) is a neurotransmitter in widely divergent species. In humans, GABA acts at inhibitory synapses in the brain and spinal cord. As in the other contexts where GABA acts as a transmitter, the inhibition results from a hyperpolarization of the synaptic transmembrane potential of the inhibited neuron, which is elicited by the binding of GABA molecules to their receptors in the post-synaptic membrane. This binding opens ion channels to allow either the flow of chloride or potassium ions into or out of the cellstained for keratin The cell is the structural and functional unit of all living organisms. Some organisms, such as bacteria, are unicellular, consisting of a single cell. Other organisms, such as humans, are multicellular, (humans have an estimated 100,0. In insectSubclass Apterygota Symphypleona globular springtails Subclass Archaeognatha (jumping bristletails) Subclass Dicondylia Monura extinct Thysanura (common bristletails) Subclass Pterygota Palaeodictyoptera extinct Ephemeroptera (mayflies) Odonata ( dragonfls GABA mediates muscleskeletal muscle Muscle is one of the four tissue types. The other three types are: epithelium, connective tissue and nervous tissue. The primary purpose of muscle tissue is to contract. Muscle contraction is used to move parts of the body, as well as to m activation at synapses between nerveA nerve is an enclosed, cable-like bundle of nerve fibers or axons, which includes the glia that ensheath the axons in myelin. Neurons are sometimes called nerve cells though this term is technically imprecise since many neurons do not form nerves. Nervess and muscle cells and also the stimulation of certain glandA gland is an organ in an animal's body that synthesizes a substance for release, often into the bloodstream ( endocrine gland) or into cavities inside the body or its outer surface ( exocrine gland). Humans have a large variety of glands, from the pituits. So far three general classes of GABA receptor are known, more than one of which is often represented in the same organismIn biology and ecology, an organism is a living being. The origin of life and the relationships between its major lineages are controversial. Two main grades may be distinguished, the prokaryotes and eukaryotes. The prokaryotes are generally considered tos. These include both so-called ionotropic receptorIonotropic receptor (also ligand gated ion channel are a subclass of transmembrane receptors. Their ion channel is regulated by a neurotransmitter ligand and is usually very selective to one or more ions like Na2+, Na+, Ca2+, or Cl-. Ionotropic receptorss, which are ion channels themselves, and metabotropic receptorMetabotropic receptor is a transmembrane receptor, which starts some intracellular biochemical cascade after its activation by an agonistic ligand. See also: ionotropic receptor. Receptors.s, which are G protein-coupled receptors that open ion channels via intermediaries ( G proteins). With regard to the human brain, it has been asserted that GABA signals interfere with the registration and consolidation stages of memory formation. This is thought to be possible because the GABA system is found in the hippocampus, an area of brain which has been implicated in memory formation.
Organisms synthesize GABA from glutamate using the enzyme L-glutamic acid decarboxylase and pyridoxal phosphate as a cofactor.
Three types of GABA receptors:
- GABAA receptors
- GABAB receptors
- GABAC receptors
Drugs which affect GABA receptors:
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