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Heart & Blood Vessels: Your Coronary Arteries. 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. Left Main Coronary Artery (also called the left main trunk)
Major blood vessels include  the Inferior Vena Cava, Superior Vena Cava, Pulmonary Artery,  Pulmonary Veins, Coronary Artery, and Aorta.    The four parts of the circulatory system are the heart, artery,  capillaries, and the veins. The heart is the center or the main  source of the circulatory system, it pumps blood throughout a  network of blood vessels. An artery is a blood vessel that carries  blood away from the body. Capillaries are very thin vessels that  gases, nutrients, and wastes pass to body cells.