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(a) Describe how heart contraction and relaxation influence coronary blood flow. (b) Name the major branches of the coronary arteries and note the heart regions served by each. (a) The coronary arteries are actively delivering blood to the myocardium when the heart is relaxed. The coronary vessels are compressed and ineffective in blood delivery when the ventricles are contracting. (b) The major branches of the coronary arteries and the areas they serve are as follows: The left coronary artery runs toward the left side of the heart and divides into the anterior interventricular artery and the circumflex artery.
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.