Sympathetic cardiac stimulating fibers in the vagi.
D000320:Adrenergic Fibers; D002316:Cardiotonic Agents; D006321:Heart / Q000294:innervation* / Q000502:physiology*; D006801:Humans; D014630:Vagus Nerve / Q000502:physiology*
D002316:Cardiotonic Agents
HEART/innervation; HEART/physiology; VAGUS NERVE/physiology