title: Mitochondria in the contraction and relaxation of heart.
mesh_terms: D000818:Animals; D001692:Biological Transport; D002118:Calcium / Q000378:metabolism*; D008931:Mitochondria, Muscle / Q000378:metabolism*; D009200:Myocardial Contraction; D009210:Myofibrils / Q000378:metabolism; D013997:Time Factors; D014336:Troponin / Q000378:metabolism
chemical_list: D014336:Troponin; D002118:Calcium