The left main coronary artery supplies blood to the left side of the heart muscle and the right coronary artery supplies blood to the right ventricle, the right atrium, and the SA (sinoatrial) and AV (atrioventricular) nodes.
The left main coronary artery divides into the left anterior descending branch (3) and the left circumflex arteries (4). Each artery supplies blood to different parts of the heart muscle and the electrical system. The heart also has veins that collect oxygen-poor blood from the heart muscle.  Location: The left coronary artery (left main coronary artery) emerges from the aorta through the ostia of the left aortic cusp, within the sinus of Valsalva. The plane of the semilunar valve is tilted so that the ostium of the left coronary artery is superior and posterior to the right coronary ostium. Coronary arteries supply blood to the myocardium and other components of the heart. Two coronary arteries originate from the left side of the heart at the beginning (root) of the aorta, just after the aorta exits the left ventricle.  The heart receives its own supply of blood from the coronary arteries. Two major coronary arteries branch off from the aorta near the point where the aorta and the left ventricle meet. These arteries and their branches supply all parts of the heart muscle with blood. 1  Left Main Coronary Artery. 2  Right Coronary Artery. 3  Collateral Circulation. Coronary arteries supply blood to the heart muscle. Like all other tissues in the body, the heart muscle needs oxygen-rich blood to function, and oxygen-depleted blood must be carried away. The coronary arteries run along the outside of the heart and have small branches that dive into the heart muscle to bring it blood. The left main coronary divides into branches: The left anterior descending artery, which branches off the left coronary artery and supplies blood to the front of the left side of the heart. The circumflex artery, which branches off the left coronary artery and encircles The left main coronary artery supplies blood to the left side of the heart muscle (the left ventricle and left atrium). The left main coronary divides into branches: The left anterior descending artery, which branches off the left coronary artery and supplies blood to the front of the left side of the heart. The circumflex artery, which branches off the left coronary artery and encircles the heart muscle. This artery supplies blood to the outer side and back of the heart This artery supplies blood to the back of the heart. Left Coronary Artery. Left Coronary Artery: The left coronary artery (LCA), which divides into the left anterior descending artery and the circumflex branch, supplies blood to the heart ventricles and left atrium. Coronary arteries supply blood to the heart muscle. The two main coronary arteries are the left and right coronary arteries. The left coronary artery (LCA), which divides into the left anterior descending artery and the circumflex branch, supplies blood to the heart ventricles and left atrium. The coronary arteries supply blood to the heart muscle itself. The right coronary artery is the major artery that supplies blood to the upper and lower chambers on the right side of the heart. There is also a left coronary artery. Watch this animation to learn more about these arteries.  The left main coronary artery supplies blood to the left side of the heart muscle (the left ventricle and left atrium). The left main coronary divides into branches: The left anterior descending artery, which branches off the left coronary artery and supplies blood to the front of the left side of the heart. The circumflex artery, which branches off the left coronary artery and encircles the heart muscle. This artery supplies blood to the outer side and back of the heart. Right coronary artery (RCA). The right coronary artery supplies blood to the right ventricle, the right atrium, and the SA (sinoatrial) and AV (atrioventricular) nodes, which regular the heart rhythm. The right coronary artery divides into smaller branches, including the right posterior descending artery and the acute marginal artery
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what part of the body does the coronary artery supply