title: Ultrastructural modifications in rat heart: responses to exercise and training.
mesh_terms: D000818:Animals; D006352:Heart Ventricles; D008297:Male; D008854:Microscopy, Electron; D008931:Mitochondria, Muscle; D009206:Myocardium / Q000166:cytology*; D005082:Physical Exertion; D051381:Rats; D013312:Stress, Physiological / Q000473:pathology