Your arteries and veins have a big job to do. They're part of a transportation system that moves blood around. Arteries carry blood loaded with oxygen from your heart to the rest of your body. Veins deliver the blood, now without much of the oxygen, back to your heart. From there, the pulmonary artery sends it to your lungs to restock it with oxygen. Your pulmonary vein brings blood back to your heart, and the process starts again.
What Could Go Wrong?
Sometimes your arteries or veins get narrowed or blocked, and blood can't go through them as easily. Any slowdown in blood flow keeps your organs from getting the oxygen and nutrients they need to do their job. If blood moves too slowly through the vessels, it can pool and form clots.
Coronary Artery Disease
You have this condition when sticky fat called plaque builds up in the walls of your coronary arteries -- vessels that supply your heart with blood. Plaque narrows the arteries, slowing blood flow…