title: Excitation-contraction coupling of isolated cardiac fibers with disrupted or closed sarcolemmas. Calcium-dependent cyclic and tonic contractions.
mesh_terms: D000200:Action Potentials; D000255:Adenosine Triphosphate / Q000494:pharmacology; D000818:Animals; D001001:Anura; D002110:Caffeine / Q000494:pharmacology; D002118:Calcium / Q000494:pharmacology / Q000502:physiology*; D002415:Cats; D006018:Glycols / Q000494:pharmacology; D006321:Heart / Q000502:physiology*; D006352:Heart Ventricles / Q000187:drug effects; D006863:Hydrogen-Ion Concentration; D008274:Magnesium / Q000494:pharmacology; D003012:Microbial Collagenase / Q000494:pharmacology; D008858:Microscopy, Phase-Contrast; D009119:Muscle Contraction; D009210:Myofibrils / Q000187:drug effects / Q000502:physiology; D051381:Rats; D012519:Sarcoplasmic Reticulum / Q000502:physiology*; D013045:Species Specificity; D014357:Trypsin / Q000494:pharmacology; D016276:Ventricular Function
chemical_list: D006018:Glycols; D002110:Caffeine; D000255:Adenosine Triphosphate; D014357:Trypsin; D003012:Microbial Collagenase; D008274:Magnesium; D002118:Calcium