[Adrenergic nature of vagal acceleration of heart beat in frogs].
Acceleration of heartbeats occurring during the irritation of vagal nerve was discovered as early as in 1846. Many hypotheses about mechanisms of its appearance proved to be not confirmed. Some authors (researchers) considered that the accelerated effect resulted from secreting a small amount of acetylcholine by vagal nerve. We discovered the cause of this groundless opinion and determined that vagal acceleration of heartbeats in frogs was accomplished, partially, by sympathetic fibres of vagal nerve, partially, by catecholamines secreted, probably, from chromaffin cells.
Smirnov
V M
VM
D000320:Adrenergic Fibers / Q000502:physiology*; D000818:Animals; D002395:Catecholamines / Q000502:physiology; D002838:Chromaffin System / Q000378:metabolism; D006339:Heart Rate; D066298:In Vitro Techniques; D011896:Rana temporaria; D014630:Vagus Nerve / Q000502:physiology*
D002395:Catecholamines
Adrenergicheskaia priroda vagusnogo uskoreniia serdtsebieniĭ u liagushek.