title: Concerning contraction and relaxation of the heart.
mesh_terms: D000199:Actins / Q000502:physiology; D000818:Animals; D002118:Calcium / Q000502:physiology; D002302:Cardiac Output; D002306:Cardiac Volume; D002415:Cats; D006321:Heart / Q000502:physiology*; D006801:Humans; D009126:Muscle Relaxation; D009200:Myocardial Contraction; D009218:Myosins / Q000502:physiology; D010210:Papillary Muscles / Q000502:physiology; D011817:Rabbits; D051381:Rats; D012519:Sarcoplasmic Reticulum / Q000502:physiology; D013314:Stress, Mechanical; D013318:Stroke Volume; D013552:Swine; D014655:Vascular Resistance; D016276:Ventricular Function
chemical_list: D000199:Actins; D009218:Myosins; D002118:Calcium