Tetramethylammonium is a muscarinic agonist in rat heart.


Studies were designed to determine if tetramethylammonium (TMA), a quaternary amine that structurally resembles the cationic portion of acetylcholine, can affect cardiac function by acting on muscarinic receptors. Experiments examined effects of this cation on 1) the spontaneous beating rate of right atrial preparations isolated from rats, 2) force of… (More)


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