title: Reconsideration of the ultrastructural basis of cardiac length-tension relations.
mesh_terms: D000199:Actins; D000818:Animals; D004548:Elasticity; D006321:Heart / Q000033:anatomy & histology* / Q000502:physiology; D006352:Heart Ventricles / Q000033:anatomy & histology; D008854:Microscopy, Electron; D009119:Muscle Contraction; D009129:Muscle Tonus; D009132:Muscles / Q000033:anatomy & histology; D009206:Myocardium / Q000648:ultrastructure*; D009218:Myosins; D010210:Papillary Muscles / Q000033:anatomy & histology; D013314:Stress, Mechanical
chemical_list: D000199:Actins; D009218:Myosins