title: The relation of pericardial pressure to chronotropic response of isolated frog hearts.
mesh_terms: D000818:Animals; D001001:Anura; D001285:Atropine / Q000494:pharmacology; D006339:Heart Rate / Q000187:drug effects*; D066298:In Vitro Techniques; D010496:Pericardium / Q000187:drug effects / Q000502:physiology*; D011312:Pressure; D011433:Propranolol / Q000494:pharmacology; D013696:Temperature
chemical_list: D001285:Atropine; D011433:Propranolol