Labels:text | screenshot OCR: How Does It Work? METRO MEDICAL CENTER CONTINUING EDUCATION PROGRAM The left and right sides of the heart are each responsible for a different task of circulating blood throughout the body. The right side takes blood from the body and sends it on to the lungs. This blood contains carbon dioxide that is removed from the body when you exhale. Oxygen rich blood from the lungs is returned to the heart through the left side where it is pumped back out to the body. Superior Vena Cava SUPERIOR VENA CAVA - RIGHT ATRIUM Blood is carried from the head and arms by the Superior Vena Cava into the Right Atrium. The other vein that flows into the Right Atrium Right Atrium is the Inferior Vena Cava. This vein carries blood from the trunk and legs to the heart. The Human Heart Turn over the transparency. An Inside Look.