Across
- 4. a system that sends blood to the heart to then be sent to the lungs
- 5. blood goes through here
- 8. CO2
- 10. gives oxygen to blood cells
Down
- 1. arteries/veins
- 2. irregular beating of the heart
- 3. carries blood towards heart
- 6. carries oxygen to organs/muscles
- 7. carries blood away from the heart
- 9. opens/closes allowing blood to pass