Karnataka PGET Medicine MCQ Answer 14

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The correct answer is C

Blood Supply of the Heart

Arteries

    • left and right coronary aa. come off aorta just above valve
    • both run in interventricular sulci, left in anterior, right in posterior
    • 80% of people are RCA (right coronary a.) dominant
Right Coronary Artery

    • supplies: RV, post LV, RA, 1/3 IVS, both nodes
    • runs along coronary groove (between RA and RV), gives off right marginal branch at inferior border, then turns to posterior part and gives off largest branch the posterior interventricular branch
    • opposite the origin of the PIV, atrioventricular nodal a. is usually given off which supplies AV node and bundle
Left Coronary Artery

    • supplies: LV, LA, ant. 2/3 IVS
    • divides into two terminal branches (anterior interventricular branch, circumflex branch) soon after entering coronary groove
    • anterior interventricular branch (a.k.a. LAD), passes along ant. interventricular groove to apex of the heart where it turns and anastomoses with the posterior interventricular branch
    • circumflex branch follows coronary groove around left border to posterior surface, terminates by giving off branches to LV and LA
    • marginal branch of circumflex follows left border

Category: Karnataka PGET 2007 MCQs

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