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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.
Many major arteries branch from the abdominal aorta to provide blood flow to the vital organs of the abdomen. Its visceral branches provide blood to organs, while its parietal branches supply blood to the tissues of the abdominal body wall. The celiac trunk is a visceral artery that splits from the abdominal aorta below the inferior phrenic artery. 2  It branches almost immediately into the left gastric, splenic, and common hepatic arteries. 3  These arteries provide blood to the stomach, spleen, and liver.