Across
- 3. pumps blood
- 6. liquid part of blood
- 7. muscle below lungs that help expand lungs
- 8. exchange of oxygen and carbon dioxide
- 9. carries oxygen poor blood
- 10. connects trachea to lung
Down
- 1. vessels that carry oxygen rich blood
- 2. stuctures that move blood around body
- 4. small arteries
- 5. system that gets O2 from outside world