| A | B |
|---|
| the heart | the strongest muscle in the body |
| veins | carry blood to the heart |
| capillaries | the smallest blood vessels which deliver oxygen to the cells in exchange for carbon dioxide |
| arteries | carry blood away from the heart |
| lungs | where carbon dioxide is removed from the blood |
| blood | carries food energy and oxygen to all of the cells |
| right side of the heart | pumps blood with carbon dioxide to the lungs |
| lub dub sound | valves opening and closing |
| valves | doors in the heart which only open one way |
| number of pumps in the heart | two |
| number of chambers in the heart | four |
| color of blood going into the lungs with carbon dioxide | blue |
| color of blood leaving the lungs with oxygen | red |
| the left side of the heart | the strongest side |
