National Geographic features several images of hearts in different states, such as a healthy heart, enlarged hearts and donor hearts. The website also offers an image of an artificial heart being implanted into a surgery patient, notes National Geographic. MedicienNet.com offers a heart image with its parts labelled.
The first picture of a heart from National Geographic is an angiogram that shows the vessels in high detail. The image of an enlarged heart shows two hearts outside of the body, one of which was normal and the other of which was enlarged by alcohol and high blood pressure. The implantation picture shows doctors placing a CardioWest artificial heart into a 62-year-old German man, notes National Geographic.
The diagram of a heart labels the atriums, ventricles, aorta, pulmonary trunk and superior vena cava, notes MedicineNet.com. The diagram also shows the heart in relation to the esophagus, trachea and sternum.