Watch the video clip and write down how heart works: Your heart is divided into left & right halves which work together like a dual pump. On the right side of your heart, deoxgenated blood from your body's tissues flows through large veins called 1 into your 2 , next the blood moves into your 3 which contracts and sends blood out of your heart to your lungs to gather oxygen & get rid of carbon dioxide. On the left side of your heart, oxygen-riched blood from your lungs flows through your 4 into your 5 , the blood then moves into your 6 , which contracts and sends blood out of your heart through the 7 to feed your cells and tissues.