title: Sarcomere length-active force relations in living mammalian cardiac muscle.
mesh_terms: D000818:Animals; D004558:Electric Stimulation; D006321:Heart / Q000502:physiology; D066298:In Vitro Techniques; D008853:Microscopy; D009119:Muscle Contraction; D010210:Papillary Muscles / Q000502:physiology*; D051381:Rats; D014159:Transducers; D014743:Videotape Recording