An interactive diagram of the human heart is available on InnerBody.com. The diagram comes in 2D and 3D versions and includes information on each part of the heart, as well as the veins and arteries connected to it. A basic diagram is available on WebMD.com.
The 2D interactive diagram on InnerBody.com includes several viewing angle options. Hover the mouse pointer over a section of the heart, vein or artery to see the part's name and information. To use the site's 3D diagram, click and hold the plus and minus signs to zoom. Drag the diagram to rotate it, and click a part of the heart to see its name.
The diagram at WebMD.com includes a simple picture, a cross-section and basic information about the heart.