<prompt> Most common site of myocardial infaction is ?Anterior wall of left ventriclePosterior wall of left ventrilcePosterior wall of right ventrilceInferior wall of left ventricle  <response>: Ans. is a i.e., Anterior wall of left ventricleAlso knowo By convention, the coronary aery that gives rise to posterior descending branch and there by perfuses the posterior third of septum is called dominant.In 80 of persons, right dominant circulation is present, i.e. posterior discending branch arises from right coronary aery.o In 20 of cases, it arises from left circumflex aery left dominant circulation. 