The dependence of cardiac membrane excitation and contractile ability on active muscle shortening (cat papillary muscle).
D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D002110:Caffeine / Q000494:pharmacology; D002415:Cats; D004558:Electric Stimulation; D006339:Heart Rate; D066298:In Vitro Techniques; D008566:Membranes / Q000502:physiology; D009200:Myocardial Contraction / Q000187:drug effects; D010210:Papillary Muscles / Q000502:physiology; D011188:Potassium / Q000502:physiology
D002110:Caffeine; D011188:Potassium