title: Force-frequency relationship in heart muscle.
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D002415:Cats; D006321:Heart / Q000502:physiology*; D066298:In Vitro Techniques; D008954:Models, Biological; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology; D009210:Myofibrils / Q000502:physiology; D010210:Papillary Muscles / Q000502:physiology; D013314:Stress, Mechanical