What is Myocardial infarction/Heart Attack with brief explanation..

what's Myocardial infarction? what is Myocardial infarction cause? what is the Myocardial infarction symptoms? what is the prevention of myocardial infarction/heart attack? what is the risk factor for Myocardial infarction/heart attack? what is diagnose of mycardial infarction/heart attack? what is the treatment of myocardial infarction/heart attack? explanation of myocardial infarction/heart attack...