title: Frequency-force relationship on isolated rat and guinea pig atria. Effects of cholinergic and adrenergic receptor antagonists.
mesh_terms: D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology*; D000319:Adrenergic beta-Antagonists / Q000494:pharmacology*; D000526:Alprenolol / Q000494:pharmacology; D000818:Animals; D001285:Atropine / Q000494:pharmacology; D004558:Electric Stimulation; D006168:Guinea Pigs; D006321:Heart / Q000187:drug effects*; D006352:Heart Ventricles / Q000187:drug effects; D066298:In Vitro Techniques; D010276:Parasympatholytics / Q000494:pharmacology*; D010646:Phentolamine / Q000494:pharmacology; D051381:Rats; D013268:Stimulation, Chemical
chemical_list: D000317:Adrenergic alpha-Antagonists; D000319:Adrenergic beta-Antagonists; D010276:Parasympatholytics; D001285:Atropine; D000526:Alprenolol; D010646:Phentolamine