This is an anatomical illustration of the human heart showcasing its major components and internal features. The image highlights the ventricles, atria, arteries, and veins, as well as the intricate network of the myocardium, endocardium, and pericardium. The sinoatrial (SA) node and atrioventricular (AV) node are also indicated, along with the coronary arteries. Predominantly, the illustration uses shades of blue and red to represent the blood vessels and muscles.