From which vessel does the heart receive the right-dominant coronary supply on the left side?

From which vessel does the heart receive the right-dominant coronary supply on the left side?

• A. Left Coronary Artery
• B. Right Coronary Artery
• C. Circumflex Artery
• D. Left Subclavian Artery

Answer: (A)

Dominance in coronary circulation refers to which artery feeds the posterior descending artery that supplies the inferior/posterior part of the heart. In the common right-dominant pattern, the right coronary artery provides that branch. In left-dominant patterns, the posterior descending artery comes from the left circumflex branch of the left coronary artery, so the left coronary system ultimately supplies more of the left-sided and posterior regions. So, when the dominant coronary supply to the left side is described, the vessel involved is the left coronary artery, which gives rise to the left circumflex (and often, via that branch, to the posterior regions of the heart in left-dominant anatomy). The other options don’t serve as the source of the left-dominant supply: the right coronary artery is the usual source in right-dominant hearts, the circumflex is a branch of the left coronary artery rather than the primary vessel itself, and the left subclavian artery is not involved in coronary blood flow.

Dominance in coronary circulation refers to which artery feeds the posterior descending artery that supplies the inferior/posterior part of the heart. In the common right-dominant pattern, the right coronary artery provides that branch. In left-dominant patterns, the posterior descending artery comes from the left circumflex branch of the left coronary artery, so the left coronary system ultimately supplies more of the left-sided and posterior regions.

So, when the dominant coronary supply to the left side is described, the vessel involved is the left coronary artery, which gives rise to the left circumflex (and often, via that branch, to the posterior regions of the heart in left-dominant anatomy). The other options don’t serve as the source of the left-dominant supply: the right coronary artery is the usual source in right-dominant hearts, the circumflex is a branch of the left coronary artery rather than the primary vessel itself, and the left subclavian artery is not involved in coronary blood flow.