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12673 Pharmacology

Besides stimulation of M3 receptors located on endothelial cells, the main mechanism of vasodilatory actions of acetylcholine includes which of the following?

ADecrease in endothelin by acetylcholine released from cholinergic nerves in blood vessels
BInhibition of norepinephrine release from adrenergic nerve endings (Correct Answer)
CStimulation of vascular smooth muscle cells
DEffects on autoregulation particularly in coronary vascular beds.