Each of these activities can be influenced by sympathetic and parasympathetic input

Each of these activities can be influenced by sympathetic and parasympathetic input

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Autonomic Nervous System * Each of these activities can be influenced by sympathetic and parasympathetic input ANS Neurotransmitters * The key to understanding the effects of the ANS lies in knowing which neurotransmitter it releases and what kind of receptors occur on the target cells. * Neurotransmitters can be classified as either cholinergic or adrenergic neurons based upon the neurotransmitter released Adrenergic Neurotransmitters * The ANS has both cholinergic fibers which secrete acetylcholine (Ach) and adrenergic fibers which secrete norepinephrine (NE) Fate of Acetylcholine * after secretion by parasympathetic fibers, it is quickly broken down by acetylcholinesterase (AChase) in the synapse, thus its effects last only a few seconds Fate of NE After Release * some are reabsorbed by nerve fiber and either reused or broken down by the enzyme monoamine oxidase (MAO) * some diffuse into the surrounding tissues, where it is degraded by another enzyme called catechol-O-methyltransferase (COMT)
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Each of these activities can be influenced by sympathetic and parasympathetic input

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