We hope you ♥ our Heart exhibit as much as we do! This larger than life, 7 foot tall heart model is made of EPS foam. A healthy adult heart pumps nearly 2000 liters of blood through 60,000 miles of blood vessels every day! That blood is primarily made in the bone marrow of the vertebrae, pelvis, ribs, and skull. Over the course of your lifetime, your heart will work harder than any other muscle in your body.