title: [Activity of heart pacemaker and thyroid hormone level in the blood of guinea pigs of different age].
mesh_terms: D000367:Age Factors; D000818:Animals; D006168:Guinea Pigs; D010138:Pacemaker, Artificial; D013960:Thyroid Function Tests; D013963:Thyroid Hormones / Q000097:blood*; D013974:Thyroxine / Q000494:pharmacology
chemical_list: D013963:Thyroid Hormones; D013974:Thyroxine
vernacular_title: Aktivita srdecního pacemakeru a hladina hormonů stítné zlázy v krvi různĕ starých morcat.