title: [The role of sympathetic and parasympathetic mechanisms in formation of heart secondary rhythms during rat ontogenesis].
mesh_terms: D000317:Adrenergic alpha-Antagonists / Q000008:administration & dosage; D000319:Adrenergic beta-Antagonists / Q000008:administration & dosage; D000818:Animals; D000831:Animals, Newborn; D001285:Atropine / Q000008:administration & dosage; D006321:Heart / Q000254:growth & development* / Q000294:innervation; D006339:Heart Rate / Q000187:drug effects / Q000502:physiology*; D018727:Muscarinic Antagonists / Q000008:administration & dosage; D010275:Parasympathetic Nervous System / Q000502:physiology*; D010646:Phentolamine / Q000008:administration & dosage; D011433:Propranolol / Q000008:administration & dosage; D051381:Rats; D017208:Rats, Wistar; D013564:Sympathetic Nervous System / Q000502:physiology*
chemical_list: D000317:Adrenergic alpha-Antagonists; D000319:Adrenergic beta-Antagonists; D018727:Muscarinic Antagonists; D001285:Atropine; D011433:Propranolol; D010646:Phentolamine