The delivery of oxygen to the heart is primarily facilitated by the coronary circulation. The coronary arteries, which branch off from the aorta, supply oxygenated blood to the heart muscle (myocardium). There are two main coronary arteries: the left coronary artery and the right coronary artery. These arteries further branch into smaller arteries and arterioles that permeate the heart tissue, ensuring that the heart receives the oxygen it needs to function effectively.
In addition to the coronary arteries, the heart's chambers (the left atrium and left ventricle) also play a role in circulating oxygenated blood throughout the body, but the direct delivery of oxygen to the heart muscle itself is the responsibility of the coronary circulation.