<prompt> True regarding coronary circulation isDominance affects anterior surfaceMost are left dominantLeft aery supplies more tissue in right dominanceDominance is dependent on nodal and marginal aery  <response>: 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 ka right dominant, and nodal aery in 65 cases. Whereas Left coronary aery LCA gives rise to Circumflex Coronary, Obtuse marginal, left diagonal, and anterior interventriculardescending aery. Mn-COLA or COLDArinA single not 3 marginal aery arise from left circumflex aery QIn right dominance the posterior interventricular descending aery is derived from right coronary aery 67Q;in left dominance it is a branch of circumflex, branch of left coronary aery. 15Q. 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 