title: Regulation of the cardiac rhythm at rest and in orthostasis.
mesh_terms: D001285:Atropine / Q000494:pharmacology; D001340:Autonomic Nerve Block; D001341:Autonomic Nervous System / Q000502:physiology; D001696:Biomechanical Phenomena; D005898:Glass / Q000494:pharmacology; D006321:Heart / Q000502:physiology*; D006706:Homeostasis; D006801:Humans; D010275:Parasympathetic Nervous System / Q000502:physiology; D011187:Posture; D011674:Pulse / Q000187:drug effects; D012146:Rest
chemical_list: C036485:obsidian; D001285:Atropine