Abstract
After a single injection of noradrenalin or dopa into albino rats noradrenalin was incorporated into adrenergic axons of the heart and deposited as granules in the small synaptic vesicles measuring about 30 nm in diameter. In this way adrenergic axons could be distinguished from cholinergic. Cholinergic axons were more numerous than adrenergic in the atria. Adrenergic terminals come into very intimate contact with cholinergic terminals and also withcapillary endothelial cells and muscle cells of the myocardium. It is postulated that adrenergic fibers may act on heart muscle in three ways: by means of presynaptic inhibition through cholinergic axons, by a humoral mechanism, and directly on the muscle cells of the myocardium.
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Semenov, S.P. Effect of sympathomimetic agents and dopa on the ultrastructure of the nervous apparatus of the heart. Bull Exp Biol Med 82, 1730–1733 (1976). https://doi.org/10.1007/BF00790401
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DOI: https://doi.org/10.1007/BF00790401