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The blood supply to the colon comes from the superior and inferior mesenteric arteries. Part of the rectum is supplied by the internal iliac system and this anastamoses with the lower branches of the inferior mesenteric system.
The left main coronary artery supplies blood to the left side of the heart muscle (the left ventricle and left atrium). The left main coronary artery divides into branches: The left anterior descending artery, which branches off the left coronary artery and supplies blood to the front of the left side of the heart.The circumflex artery, which branches off the left coronary artery and encircles the heart muscle. This artery supplies blood to the lateral side and back of the heart.ince coronary arteries deliver blood to the heart muscle, any coronary artery disorder or disease can have serious implications by reducing the flow of oxygen and nutrients to the heart, which may lead to a heart attack and possibly death.