High efficiency coupling between beta-adrenergic receptors and cardiac contractility: direct evidence for "spare" beta-adrenergic receptors.
D000319:Adrenergic beta-Antagonists / Q000494:pharmacology; D000818:Animals; D002415:Cats; D004347:Drug Interactions; D066298:In Vitro Techniques; D007545:Isoproterenol / Q000494:pharmacology; D008566:Membranes / Q000187:drug effects; D009200:Myocardial Contraction / Q000187:drug effects*; D010210:Papillary Muscles / Q000187:drug effects; D011941:Receptors, Adrenergic / Q000502:physiology*; D011943:Receptors, Adrenergic, beta / Q000187:drug effects / Q000502:physiology*; D013997:Time Factors
D000319:Adrenergic beta-Antagonists; D011941:Receptors, Adrenergic; D011943:Receptors, Adrenergic, beta; D007545:Isoproterenol