True regarding coronary circulation is

C i.e. Left aery supplies more tissue in right dominance Right coronary aery arise from anterior aoic sinus, has lesser diameter (than LCA), supplies major pa of right ventricle & right atriumQ. RCA gives rise to acute marginal, right conus (infundibular), posterior interventricular /descending (in most 67-90% cases and these are k/a right dominant), and nodal aery (in 65% cases). Whereas Left coronary aery (LCA) gives rise to Circumflex Coronary, Obtuse marginal, left diagonal, and anterior interventricular(descending) aery. (Mn-"COLA or COLDArin")A single (not 3) marginal aery arise from left circumflex aery QIn 'right dominance' the posterior interventricular (descending) aery is derived from right coronary aery (67%)Q;in left dominance' it is a branch of circumflex, branch of left coronary aery. (15%)Q. In a 'Co- dominant or balanced' pattern, branches of both left & right coronary aery run in or near the posterior interventricular groove (18%).Term dominance is misleading as the left aery almost always supplies a greater volume myocardiumQ.Occlusion of anterior descending branch of LAD will cause infarction of anterior wall of left ventricleQ