when it is released by a neuron

when it is released by a neuron - nervous system when it is...

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nervous system * when it is released by a neuron. Types of Neurotransmitters Three major categories * Acetylcholine * Amino Acids * GABA * Glycine * Aspartic acid * Glutamic acid * Biogenic amines (monoamines) * Catecholamines * epinephrine * norepinephrine * dopamine * Serotonin * Hisamine * Neuropeptides Synapse Excitatory Cholinergic synapse * employs acetylcholine as its neurotransmitter (can be excitatory or inhibitory) * opens Na+ channels Inhibitory GABA-ergic synapse * opens Cl- channels causing a hyperpolarization Adrenergic excitatory synapse * employs norepinephrine * acts through second messenger systems such as cyclic AMP * the receptor is not an ion gate but an integral protein associated with G protein Inactivation of Neurotransmitters The action of neurotransmitters can be stopped by four different mechanisms 1. Diffusion: the neurotransmitter drifts away, out of the synaptic cleft where it can no longer act on a receptor.
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