<span>The right side of your heart receives blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite: It receives blood from the lungs and pumps it out to the body. Blood that travels from the lungs to the body contains oxygen from the lungs. Blood that travels from the body to the right side of the heart contains CO2 which is breathed out when it gets to the lungs.</span>
