Blood enters the right and the left coronary arteries directly from THE AORTA.
Blood is supplied to the heart via the coronary arteries. The left and the right coronary arteries together with their branches carry blood to all part of the heart muscles. The left coronary artery supply blood to the left atrium, the side, front, bottom and back of the left ventricle and the front of the septum. The right coronary artery supply blood to the right atrium, right ventricle, bottom portion of both left and right ventricle and the back of the septum.
