Heart Bypass Surgery is an open-heart surgery that is used to treat blockages of the heart arteries. When there is a heart artery blockage, blood supply to areas of the heart are affected. A heart bypass is attached beyond the blockage restoring blood flow to that area. Heart bypasses are either arteries or veins taken from other parts of the body including the chest wall and the legs. This article is a picture guide to heart bypass surgery that takes you through many critical stages of the operation.