Question
True regarding blood supply of conduction system of heart is/are?
A. Left coronary artery is the main supply
B. Right coronary artery supplies SA node in most cases
C. SA node can also be supplied by circumflex artery
D. AV node is supplied by left anterior descending coronary artery
E. Dominant coronary artery supplies AV node
Show Answer
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Correct Answer » B:C:E
Explanation
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Ans. B, C & E
Right coronary artery is the main supply of conducting system of heart supplying whole conducting system except right bundle branch and a part of left branch of AV bundle.
SA node is supplied by nodal artery, a branch of RCA in 65% cases and a branch of circumflex branch of LCA in 35% cases.
The atrioventricular nodal artery is most commonly (about 90% of heart) a branch of the right coronary artery.
This is associated with the dominance of the coronary artery circulation, right-dominant individuals the blood supply from the right coronary artery while in left dominant individual it originates from the left circumflex artery.
