The coronary arteries are blood vessels that supply oxygen-rich blood to the heart muscle. They branch off from the aorta, the main artery of the body, and are essential for maintaining the heart's health and function. There are two main coronary arteries: the left coronary artery and the right coronary artery, each further dividing into smaller branches. When these arteries become narrowed or blocked, it can lead to 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 arteries, affecting blood flow to the heart.