Tonic afferent sympathetic activity from the heart.
D000200:Action Potentials; D000818:Animals; D002415:Cats; D004594:Electrophysiology; D006321:Heart / Q000294:innervation*; D006325:Heart Atria / Q000294:innervation; D006329:Heart Conduction System / Q000502:physiology; D011984:Sensory Receptor Cells / Q000502:physiology; D013564:Sympathetic Nervous System / Q000502:physiology*