The Heart is a muscular organ that pumps blood to the body. It is located a little to the left of the middle of the chest. The Heart is about the size of a clenched fist. The right side of the Heart receives blood from the body and pumps it to the lungs. The left side of the Heart receives blood from the lungs and pumps it out to the body. A healthy heart pumps 2,000 gallons of blood every day.