title: Velocity of shortening of unloaded heart muscle and the length-tension relation.
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D002118:Calcium / Q000494:pharmacology; D002415:Cats; D004548:Elasticity; D004558:Electric Stimulation; D006321:Heart / Q000187:drug effects / Q000502:physiology*; D008722:Methods; D009119:Muscle Contraction; D009210:Myofibrils / Q000187:drug effects / Q000502:physiology*; D010210:Papillary Muscles / Q000502:physiology; D013997:Time Factors
chemical_list: D002118:Calcium