The coronary arteries are blood vessels that supply oxygen-rich blood to the heart muscle. They branch off from the aorta, the main artery that carries blood from the heart to the rest of the body. There are two main coronary arteries: the left coronary artery and the right coronary artery, each further dividing into smaller branches to ensure the entire heart receives adequate blood flow. When these arteries become narrowed or blocked, it can lead to serious conditions such as angina or heart attacks. Factors like high blood pressure, high cholesterol, and smoking can contribute to the buildup of plaque in the coronary arteries, which restricts blood flow and can damage the heart.