Which coronary artery supplies the SA node usually via its nodal branch?

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Multiple Choice

Which coronary artery supplies the SA node usually via its nodal branch?

Explanation:
The right coronary artery. The SA node is most commonly supplied by a nodal artery that branches from the right coronary artery and travels to the sinoatrial node, especially in hearts with right-dominant circulation. This means occlusions or ischemia in the RCA can directly affect sinus node blood flow and function. In a smaller subset of people with left-dominant circulation, the left circumflex artery may provide the nodal supply, but the usual source is the right coronary artery.

The right coronary artery. The SA node is most commonly supplied by a nodal artery that branches from the right coronary artery and travels to the sinoatrial node, especially in hearts with right-dominant circulation. This means occlusions or ischemia in the RCA can directly affect sinus node blood flow and function. In a smaller subset of people with left-dominant circulation, the left circumflex artery may provide the nodal supply, but the usual source is the right coronary artery.

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