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Neurotransmitters and Neuropharmacology (Ch 4)

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Amine Neurotransmitters   Neurotransmitter based on modifications of a single amino acid nucleus. (acetylcholine,serotonin, dopamine)  
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Amino Acid Neurotransmitter   A neurotransmitter that is itself an amino acid (GABA, glycine, glutamate)  
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Peptide Neurotransmitter   A neurotransmitter consisting of a short chain of amino acids  
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Gas Neurotransmitter   A soluble gas that is produced and released by a neuron to alter the functioning of another neuron  
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Ionotropic Receptor (fast)   A receptor protein that include an ion channel that is opened when the receptor is bound by an agonist  
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Metabolic Receptor (slow)   A receptor protein that does not contain an ion channel but may when activated use a G protein system to open a nearby ion channel  
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Ligand   A substance that binds to a receptor  
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Agonist   A molecule that binds to a receptor molecule and initiates a response  
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Antagonist   A molecule that interferes with or prevents the action of a transmitter  
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Inverse Antagonist   A substance that binds to a receptor and causes it to do the opposite of what the naturally occurring transmitter does  
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Endogenous Ligands   Produced inside the body  
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Exogenous Ligands   Arising from outside the body  
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Co-Localization/Co-Release   The appearance of more than one neurotransmitter in a given presynaptic terminal  
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Cholinergic   Referring to cells that use ACh as their synaptic transmitter  
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Nicotinic   Referring to cholinergic receptors that respond to nicotine AND ACh  
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Muscarinic   Referring to cholinergic receptors that respond to mucsarine AND ACh  
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5 monoamines   Catecholamines, indoleamines, dopamine, norepinephrine, serotonin  
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Excitotoxicity   The property by which neurons die when overstimulated  
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Retrograde Transmitter   A neurotransmitter that diffuses from the postsynaptic neuron to the presynaptic neuron  
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Affinity   The degree of chemical attraction between a ligand and a receptor  
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Efficacy/intrinsic activity   The extent to which a drug activates a response when it binds to a receptor  
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Partial Agonist/Partial Antagonist   A drug that when bound to a receptor has less effect than the endogenous ligand  
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Modulatory Site   A portion of a receptor that when bound by a compound alters the receptors response to it's transmitter. Binds to a site different than the transmitter site  
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Metabolic tolerance   THe form of drug tolerance that arises when repeated exposure to the drug causes the metabolic machinery (liver, etc) of the body to become more efficient at clearing the drug  
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Functional tolerance   decreased responding to a drug after repeated exposures (brain tissue doesn't respond anymore)  
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Cross tolerance   A condition in which the development of tolerance for one drug causes an individual to develop tolerance to another drug  
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Sensitization   A process in which the body shows an enhanced response to a given drug after repeated doses  
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