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°Système sympathiqueOrigine: cordons sympathiques au niveau de la _______ _________Médiateurs: ____________ agissant sur les récepteurs nicotiniques Innervation: cœur et vaisseauxSécrétion par les synapses effectrices:-soit de la noradrénaline: action sur les récepteurs adrénergiques (VASOCONSTRICTION*)-soit de l'acétylcholine: action sur les récepteurs muscariniques entraînant une VASODILATATION
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